ORCID Profile
0000-0002-5325-2709
Current Organisation
University of Melbourne
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Astronomical and Space Sciences | Astronomy And Astrophysics | Cosmology and Extragalactic Astronomy | Astronomical and Space Instrumentation | Galactic Astronomy | Stellar Astronomy and Planetary Systems | Information Storage, Retrieval And Management | Information Systems | Instruments And Techniques | Optics And Opto-Electronic Physics | Global Information Systems | Information Systems Development Methodologies | Ionospheric And Magnetospheric Physics | Signal Processing | Information Systems Organisation | Geodynamics | Software Engineering | Geomechanics and Resources Geotechnical Engineering | Resources Engineering and Extractive Metallurgy | Petroleum and Reservoir Engineering | Decision Support And Group Support Systems | Database Management
ANZSRC Socio-Economic Objective (SEO)
Physical sciences | Expanding Knowledge in the Physical Sciences | Information processing services | Scientific instrumentation | Library and related information services | Technological and organisational innovation | Expanding Knowledge in Technology | Scientific Instruments | Expanding Knowledge in Engineering | Management of Greenhouse Gas Emissions from Mineral Resource Activities | Application tools and system utilities | Geothermal Energy Extraction | Oil and Gas Extraction | Education and Training not elsewhere classified | Computer software and services not elsewhere classified | Electronic Information Storage and Retrieval Services |
Related Links
Publications
The Central Velocity Dispersion of the Lensing Galaxy in the Quadruple Lens System Q2237+0305
Publisher: American Astronomical Society
Date: 02-1992
DOI: 10.1086/186288
Modelling and peeling extended sources with shapelets: A Fornax A case study
Publisher: Cambridge University Press (CUP)
Date: 2020
DOI: 10.1017/PASA.2020.18
Abstract: To make a power spectrum (PS) detection of the 21-cm signal from the Epoch of Reionisation (EoR), one must avoid/subtract bright foreground sources. Sources such as Fornax A present a modelling challenge due to spatial structures spanning from arc seconds up to a degree. We compare modelling with multi-scale (MS) CLEAN components to ‘shapelets’, an alternative set of basis functions. We introduce a new image-based shapelet modelling package, SHAMFI. We also introduce a new CUDA simulation code (WODEN) to generate point source, Gaussian, and shapelet components into visibilities. We test performance by modelling a simulation of Fornax A, peeling the model from simulated visibilities, and producing a residual PS. We find the shapelet method consistently subtracts large-angular-scale emission well, even when the angular resolution of the data is changed. We find that when increasing the angular resolution of the data, the MS CLEAN model worsens at large angular scales. When testing on real Murchison Widefield Array data, the expected improvement is not seen in real data because of the other dominating systematics still present. Through further simulation, we find the expected differences to be lower than obtainable through current processing pipelines. We conclude shapelets are worthwhile for subtracting extended galaxies, and may prove essential for an EoR detection in the future, once other systematics have been addressed.
Differential microlensing measurements of quasar broad-line kinematics in Q2237+0305
Publisher: Oxford University Press (OUP)
Date: 11-07-2011
Limits on the microlens mass function of Q2237+0305
Publisher: Oxford University Press (OUP)
Date: 11-06-2000
Commission 47: Cosmology: (Cosmologie)
Publisher: Cambridge University Press (CUP)
Date: 2000
DOI: 10.1017/S0251107X00003242
Abstract: Cosmology is one of the most dynamically evolving areas of astrophysics today. Twenty years ago the estimates of the litude of the primordial fluctuations were about 10 -3 , almost a factor of 100 off of today’s measurements. Ten years ago we could only hope for high precision measurements of large scale structure, there were less than 5000 redshifts measured, and only a handful of normal galaxies with z 1 were known. Computer models of structure formation had just begun to consider non-power-law spectra based on physical models like hot/cold dark matter. As a consequence there was considerable freedom in adjusting parameters in the various galaxy formation scenarios. In contrast, many of today’s debates are about factors of 2 and soon we will be arguing about 10% differences. The Harrison-Zeldovich shape of the primordial fluctuation spectrum, first derived from philosophical arguments can now be quantified from detections of fluctuations by COBE. The number of available redshifts is beyond 50,000, and soon we will have redshift surveys surpassing 1 million galaxies. N-body simulations are becoming more sophisticated, of higher resolution, and incorporating complex gas dynamics.
Host galaxy contribution to the colours of 'red' quasars
Publisher: Oxford University Press (OUP)
Date: 21-12-1998
Loan and nonloan flows in the Australian interbank network
Publisher: Elsevier BV
Date: 05-2012
Field Deployment of Prototype Antenna Tiles for the Mileura Widefield Array Low Frequency Demonstrator
Publisher: American Astronomical Society
Date: 05-03-2007
DOI: 10.1086/511068
H1517+656: The Birth of a BL Lacertae Object?
Publisher: American Astronomical Society
Date: 07-2005
DOI: 10.1086/425991
The nature of the optical emission in radio-selected AGN
Publisher: WORLD SCIENTIFIC
Date: 10-2004
The H I Parkes All Sky Survey: southern observations, calibration and robust imaging
Publisher: Oxford University Press (OUP)
Date: 11-04-2001
A microlensing measurement of the size of the broad emission-line region in the lensed quasar QSO 2237+0305
Publisher: Oxford University Press (OUP)
Date: 11-05-2005
The neutral hydrogen properties of galaxies in gas-rich groups
Publisher: Oxford University Press (OUP)
Date: 29-12-2018
Constraining the 21 cm brightness temperature of the IGM at z = 6.6 around LAEs with the murchison widefield array
Publisher: Oxford University Press (OUP)
Date: 03-08-2021
Abstract: The locations of Ly α-emitting galaxies (LAEs) at the end of the Epoch of Reionization (EoR) are expected to correlate with regions of ionized hydrogen, traced by the redshifted 21 cm hyperfine line. Mapping the neutral hydrogen around regions with detected and localized LAEs offers an avenue to constrain the brightness temperature of the Universe within the EoR by providing an expectation for the spatial distribution of the gas, thereby providing prior information unavailable to power spectrum measurements. We use a test set of 12 h of observations from the Murchison Widefield Array (MWA) in extended array configuration, to constrain the neutral hydrogen signature of 58 LAEs, detected with the Subaru Hypersuprime Cam in the Silverrush survey, centred on z = 6.58. We assume that detectable emitters reside in the centre of ionized H ii bubbles during the end of reionization, and predict the redshifted neutral hydrogen signal corresponding to the remaining neutral regions using a set of different ionized bubble radii. A pre-whitening matched filter detector is introduced to assess detectability. We demonstrate the ability to detect, or place limits upon, the litude of brightness temperature fluctuations, and the characteristic H ii bubble size. With our limited data, we constrain the brightness temperature of neutral hydrogen to ΔTB & mK (& mK) at 95 per cent (99 per cent) confidence for lognormally distributed bubbles of radii, RB = 15 ± 2h−1 cMpc.
Multi-object spectroscopy of the field surrounding PKS 2126-158: Discovery of a z = 0.66 galaxy group
Publisher: Oxford University Press (OUP)
Date: 05-2006
High-energy sources at low radio frequency: the Murchison Widefield Array view ofFermiblazars
Publisher: EDP Sciences
Date: 04-2016
Application of the contouring method to extended microlensed sources
Publisher: Oxford University Press (OUP)
Date: 11-06-1999
Cosmological obscuration by galactic dust: Effects of dust evolution
Publisher: Oxford University Press (OUP)
Date: 05-1999
A measurement of the transverse velocity of Q2237+0305
Publisher: Oxford University Press (OUP)
Date: 11-10-1999
HI mass function from HIPASS
Publisher: Cambridge University Press (CUP)
Date: 1999
DOI: 10.1071/AS99008
Abstract: The H I Parkes All Sky Survey (HIPASS) is a blind search for extragalactic neutral hydrogen, covering the whole of the southern sky. We present the latest H I mass function (HIMF) constructed from a s le of 263 galaxies with declinations −62°. Standard Σ1/ V max and maximum likelihood techniques are used in the analysis. No upturn in the low-mass end of the HIMF is yet seen, though our selection procedure presently conspires against the lowest-mass galaxies.
KOALA: A wide-field, 1000 element integral-field unit for the Anglo-Australian Telescope
Publisher: SPIE
Date: 24-09-2012
DOI: 10.1117/12.925812
The optical emission from gamma-ray quasars
Publisher: Cambridge University Press (CUP)
Date: 2003
DOI: 10.1071/AS01123
Abstract: We present photometric observations of six radio-loud quasars that were detected by the COMPTEL gamma-ray telescope. The data encompass seven wavebands in the optical and near infrared. After correction for Galactic extinction, we find a wide range in optical slopes. Two sources are as blue as optically-selected quasars, and are likely to be dominated by the accretion disc emission, while three others show colours consistent with a red synchrotron component. We discuss the properties of the COMPTEL s le of quasars, as well as the implications our observations have for multiwavelength modelling of gamma-ray quasars.
Using the 2 degree Field galaxy redshift survey to detect gravitationally lensed quasars
Publisher: Oxford University Press (OUP)
Date: 11-03-2001
HI in the Local Universe II
Publisher: Cambridge University Press (CUP)
Date: 1999
DOI: 10.1071/AS99001
DIVISION VIII: GALAXIES AND THE UNIVERSE
Publisher: Cambridge University Press (CUP)
Date: 14-05-2010
DOI: 10.1017/S1743921310005181
Abstract: The business meeting of Division VIII was held on 12 August 2009 14:00-15:00 in room R2.6 together with the business meeting of Commissions 28 and 47.
Gravitational lensing by elliptical galaxies
Publisher: Oxford University Press (OUP)
Date: 04-04-2000
The HIPASS Catalogue: HI Sources from a Blind Survey of the Southern Sky
Publisher: Springer Netherlands
Date: 2003
A Search for Fast Radio Bursts at Low Frequencies with Murchison Widefield Array High Time Resolution Imaging
Publisher: American Astronomical Society
Date: 10-12-2015
LENSVIEW: Software for modelling resolved gravitational lens images
Publisher: Oxford University Press (OUP)
Date: 11-2006
A study of neutral hydrogen in five small galaxy groups
Publisher: Oxford University Press (OUP)
Date: 07-2001
First limits on the 21 cm power spectrum during the Epoch of X-ray heating
Publisher: Oxford University Press (OUP)
Date: 19-05-2016
A gravitational microlensing determination of continuum source size in Q2237+0305
Publisher: Oxford University Press (OUP)
Date: 11-06-2000
Black hole mass estimates of radio-selected quasars
Publisher: American Astronomical Society
Date: 09-2002
DOI: 10.1086/341729
The impact of tandem redundant/sky-based calibration in MWA Phase II data analysis
Publisher: Cambridge University Press (CUP)
Date: 2020
DOI: 10.1017/PASA.2020.37
Abstract: Precise instrumental calibration is of crucial importance to 21-cm cosmology experiments. The Murchison Widefield Array’s (MWA) Phase II compact configuration offers us opportunities for both redundant calibration and sky-based calibration algorithms using the two in tandem is a potential approach to mitigate calibration errors caused by inaccurate sky models. The MWA Epoch of Reionization (EoR) experiment targets three patches of the sky (dubbed EoR0, EoR1, and EoR2) with deep observations. Previous work in Li et al. (2018) and (2019) studied the effect of tandem calibration on the EoR0 field and found that it yielded no significant improvement in the power spectrum (PS) over sky-based calibration alone. In this work, we apply similar techniques to the EoR1 field and find a distinct result: the improvements in the PS from tandem calibration are significant. To understand this result, we analyse both the calibration solutions themselves and the effects on the PS over three nights of EoR1 observations. We conclude that the presence of the bright radio galaxy Fornax A in EoR1 degrades the performance of sky-based calibration, which in turn enables redundant calibration to have a larger impact. These results suggest that redundant calibration can indeed mitigate some level of model incompleteness error.
Are gamma-ray bursts at cosmological distances?
Publisher: Cambridge University Press (CUP)
Date: 1993
DOI: 10.1017/S1323358000025856
Abstract: We review the discovery of gamma-ray bursts, and summarise the new data from the Compton Gamma-Ray Observatory. We evaluate the evidence that gamma-ray bursts are at cosmological distances, and discuss applications of such gamma-ray bursts to cosmological problems.
The HIPASS catalogue - I. Data presentation
Publisher: Oxford University Press (OUP)
Date: 06-2004
FIRST SEASON MWA EOR POWER SPECTRUM RESULTS AT REDSHIFT 7
Publisher: American Astronomical Society
Date: 09-12-2016
A Search for Close Separation (<= 1) Quasar Images
Publisher: Springer Berlin Heidelberg
Date: 1992
Calibration for the HIPASS Continuum Catalogue
Publisher: American Geophysical Union (AGU)
Date: 04-2011
DOI: 10.1029/2009RS004323
New constraints on the quasar broad emission line region
Publisher: American Astronomical Society
Date: 29-06-2012
Stacked reverberation mapping
Publisher: Oxford University Press (OUP)
Date: 12-06-2013
The Close-Separation Gravitational Lens Candidate Q1009-0252
Publisher: American Astronomical Society
Date: 11-1994
DOI: 10.1086/117174
Using the Properties of Broad Absorption Line Quasars to Illuminate Quasar Structure
Publisher: Oxford University Press (OUP)
Date: 11-06-2018
Division VIII: Galaxies and the universe
Publisher: Cambridge University Press (CUP)
Date: 12-2005
DOI: 10.1017/S1743921306004704
Abstract: As documented by the reports of the Presidents of Commission 28 and Commission 47 the fields of extra-galactic research and cosmology have experienced a higher and higher development leading to a vast harvest of results and discoveries. They range from the description of the overall structure of the universe to that of the in idual properties of galaxies. The availability of very large telescopes and the coverage of regions of the sky with deep surveys, on the observational side, and the wide use of sophisticated numerical simulations on the theoretical one are starting to produce a satisfactory understanding of the physical processes taking place during the evolution of galaxies. Very often there is an profitable interplay between the subjects of the two Commissions without clearcut boundaries. This makes Division VIII, which is one of the largest of the IAU, counting 1373 members, very well balanced and deserving to remain without modifications for the future.
Substructure in the Coma Cluster
Publisher: American Astronomical Society
Date: 06-1987
DOI: 10.1086/165310
Quantifying ionospheric effects on time-domain astrophysics with the Murchison Widefield Array
Publisher: Oxford University Press (OUP)
Date: 02-09-2015
Division VIII: Galaxies and the Universe
Publisher: Cambridge University Press (CUP)
Date: 12-2009
DOI: 10.1017/S1743921308025702
Abstract: Division VIII provides a focus for astronomers studying a wide range of problems related to galaxies and cosmology. Objects of the study include in idual galaxies, groups and clusters of galaxies, large scale structure, comic microwave background radiation and the universe itself. Approaches are erse from observational one to theoretical one including computer simulations.
LOW-FREQUENCY OBSERVATIONS OF LINEARLY POLARIZED STRUCTURES IN THE INTERSTELLAR MEDIUM NEAR THE SOUTH GALACTIC POLE
Publisher: American Astronomical Society
Date: 10-10-2016
The HIPASS catalogue - II. Completeness, reliability and parameter accuracy
Publisher: Oxford University Press (OUP)
Date: 06-2004
First Season MWA Phase II Epoch of Reionization Power Spectrum Results at Redshift 7
Publisher: American Astronomical Society
Date: 17-12-2019
Gravitational lensing and galaxy shape
Publisher: Oxford University Press (OUP)
Date: 04-1985
Detection of crab giant pulses using the mileura widefield array low frequency demonstrator field prototype system
Publisher: American Astronomical Society
Date: 14-12-1970
DOI: 10.1086/519444
The Murchison Widefield Array Commissioning Survey: A Low-Frequency Catalogue of 14 110 Compact Radio Sources over 6 100 Square Degrees
Publisher: Cambridge University Press (CUP)
Date: 2014
DOI: 10.1017/PASA.2014.40
Abstract: We present the results of an approximately 6 100 deg 2 104–196 MHz radio sky survey performed with the Murchison Widefield Array during instrument commissioning between 2012 September and 2012 December: the MWACS. The data were taken as meridian drift scans with two different 32-antenna sub-arrays that were available during the commissioning period. The survey covers approximately 20.5 h RA 8.5 h, − 58° Dec −14°over three frequency bands centred on 119, 150 and 180 MHz, with image resolutions of 6–3 arcmin. The catalogue has 3 arcmin angular resolution and a typical noise level of 40 mJy beam − 1 , with reduced sensitivity near the field boundaries and bright sources. We describe the data reduction strategy, based upon mosaicked snapshots, flux density calibration, and source-finding method. We present a catalogue of flux density and spectral index measurements for 14 110 sources, extracted from the mosaic, 1 247 of which are sub-components of complexes of sources.
A digital-receiver for the MurchisonWidefield Array
Publisher: Springer Science and Business Media LLC
Date: 22-02-2015
Weighing a galaxy bar in the lens Q2237 + 0305
Publisher: Oxford University Press (OUP)
Date: 04-1998
Imaging H I in the lensing galaxy 2237+0305
Publisher: Oxford University Press (OUP)
Date: 11-1999
Quasar-galaxy associations
Publisher: Springer Berlin Heidelberg
Date: 1992
The optical/near-IR colours of red quasars
Publisher: Cambridge University Press (CUP)
Date: 2000
DOI: 10.1071/AS00056
Abstract: We present quasi-simultaneous multi-colour optical/near-IR photometry for 157 radio selected quasars, forming an unbiassed sub-s le of the Parkes Flat-Spectrum S le. Data are also presented for 12 optically selected QSOs, drawn from the Large Bright QSO Survey. The spectral energy distributions of the radio- and optically-selected sources are quite different. The optically selected QSOs are all very similar: they have blue spectral energy distributions curving downwards at shorter wavelengths. Roughly 90% of the radio-selected quasars have roughly power-law spectral energy distributions, with slopes ranging from F v ∝ v 0 to F v ∝ v −2 . The remaining 10% have spectral energy distributions showing sharp peaks: these are radio galaxies and highly reddened quasars. Four radio sources were not detected down to magnitude limits of H ∼ 19·6. These are probably high redshift ( z 3) galaxies or quasars. We show that the colours of our red quasars lie close to the stellar locus in the optical: they will be hard to identify in surveys such as the Sloan Digital Sky Survey. If near-IR photometry is added, however, the red power-law sources can be clearly separated from the stellar locus: IR surveys such as 2MASS should be capable of finding these sources on the basis of their excess flux in the K -band.
The weak clustering of gas-rich galaxies
Publisher: American Astronomical Society
Date: 10-01-2007
DOI: 10.1086/508799
Quasar-Galaxy Associations
Publisher: Springer Berlin Heidelberg
Date: 1992
A Search for Bright Kuiper Belt Objects
Publisher: Cambridge University Press (CUP)
Date: 1998
DOI: 10.1071/AS98176
Abstract: Since 1992, 60 large Kuiper Belt objects have been detected by ground-based telescopes. Previous surveys which have detected objects have searched approximately 60□° and detected objects with magnitudes 20·6 m R 25·0. However, the luminosity function of brighter Kuiper Belt objects is not well determined. The detection of brighter objects would improve our ability to determine the Kuiper Belt objects' surface composition and provide constraints on the population statistics of different formation mechanisms. This paper describes a survey of 12·0□° of sky near the ecliptic to a limiting magnitude of m R ∼ 21. A slow moving candidate was detected near the magnitude limit of the survey.
HST imaging of four gravitationally lensed quasars
Publisher: Oxford University Press (OUP)
Date: 06-07-2018
SkyMapper colours of Seyfert galaxies and changing-look AGN - II. Newly discovered changing-look AGN
Publisher: Oxford University Press (OUP)
Date: 21-12-2022
Abstract: Changing-look active galactic nuclei (CLAGN) are AGN that change type as their broad emission lines appear or disappear, which is usually accompanied by strong flux changes in their blue featureless continuum. We search for turn-on CLAGN by selecting type-2 AGN from the spectroscopic Six-degree Field Galaxy Survey (6dFGS), whose colours, observed ∼15 yr later by the SkyMapper Southern Survey, are suggestive of type-1 AGN. Starting from 1092 type-2 AGN, we select 20 candidates for follow-up and confirm that 14 of them have changed into type-1 and are thus turn-on CLAGN further observations reveal 11 more turn-on CLAGN. While our search was not tailored to efficiently discover turn-off CLAGN, we discover two such cases as well. The result suggests a turn-on CLAGN rate of over 3 per cent over ∼15 yr and imply a total CLAGN rate of more than ∼6 per cent over this period. Finally, we present observations of AGN that are atypical for the CLAGN phenomenology, including J1109146 – a type-1 that did not appear as an AGN at all in 6dFGS J1406507 – the second reported changing-look narrow-line Seyfert 1 and J1340153 – a CLAGN with a change time-scale of 3 months.
Interpreting the light curve of Q2237+0305
Publisher: American Astronomical Society
Date: 12-1991
DOI: 10.1086/116015
Erratum: Choirs, H i galaxy groups: catalogue and detection of star-forming dwarf group members
Publisher: Oxford University Press (OUP)
Date: 21-07-2017
MURCHISON WIDEFIELD ARRAY OBSERVATIONS OF ANOMALOUS VARIABILITY: A SERENDIPITOUS NIGHT-TIME DETECTION OF INTERPLANETARY SCINTILLATION
Publisher: American Astronomical Society
Date: 07-08-2015
TheHubble Space TelescopeSurvey of BL Lacertae Objects: Gravitational Lens Candidates and Other Unusual Sources
Publisher: American Astronomical Society
Date: 10-08-1999
DOI: 10.1086/307552
Determining Quasar Orientation
Publisher: Oxford University Press (OUP)
Date: 04-11-2019
Abstract: Since the discovery of active galactic nuclei (AGN) and their subclasses, a unification scheme of AGN has been long sought. Orientation-based unified models predict that some of the ersity within AGN subclasses can be explained by the different viewing angles of the observer. Several orientation categorisations have been suggested, but a widely applicable measure has yet to be found. Using the properties of the ultraviolet and optical broad emission lines of quasars, in particular the velocity offsets and line widths of high-ionisation C iv and low-ionisation Mg ii lines, a correlation has been measured. It is postulated that this correlation is due to the viewing angle of the observer. Comparison with other orientation tracers shows consistency with this interpretation. Using a simulation of a wide angle disk-wind model for the broad emission line region, we successfully replicate the observed correlation with inclination. Future more detailed modelling will not only enable improved accuracy in the determination of the viewing angle to in idual AGN, but will also substantially increase our understanding of the emitting regions of AGN.
Black Hole Mass Estimation: How Good is the Virial Estimate?
Publisher: Cambridge University Press (CUP)
Date: 2016
DOI: 10.1017/PASA.2016.8
Abstract: Black hole mass is a key factor in determining how a black hole interacts with its environment. However, the determination of black hole masses at high redshifts depends on secondary mass estimators, which are based on empirical relationships and broad approximations. A dynamical disk wind broad line region model (BLR) of active galactic nuclei is built in order to test the impact of different BLR geometries and inclination angles on the black hole mass estimation. Monte Carlo simulations of two disk wind models are constructed to recover the virial scale factor, f , at various inclination angles. The resulting f values strongly correlate with inclination angle, with large f values associated with small inclination angles (close to face-on) and small f values with large inclination angles (close to edge-on). The recovered f factors are consistent with previously determined f values, found from empirical relationships. Setting f as a constant may introduce a bias into virial black hole mass estimates for a large s le of active galactic nuclei. However, the extent of the bias depends on the line width characterisation (e.g. full width at half maximum or line dispersion). Masses estimated using $f_{\\text{FWHM}}$ tend to be biased towards larger masses, but this can generally be corrected by calibrating for the width or shape of the emission line.
A microlensing study of the accretion disc in the quasar MG 0414+0534★
Publisher: Oxford University Press (OUP)
Date: 21-12-2008
The spectra of red quasars
Publisher: Cambridge University Press (CUP)
Date: 2001
DOI: 10.1071/AS01039
Abstract: We measure the spectral properties of a representative sub-s le of 187 quasars, drawn from the Parkes Half-Jansky, Flat-radio-spectrum S le (PHFS). Quasars with a wide range of rest-frame optical/UV continuum slopes are included in the analysis: their colours range over 2 B – K 7. We present composite spectra of red and blue sub-s les of the PHFS quasars, and tabulate their emission line properties. The median Hβ and [O III] emission line equivalent widths of the red quasar sub-s le are a factor of ten weaker than those of the blue quasar sub-s le. No significant differences are seen between the equivalent width distributions of the C IV, C III] and Mg II lines. Both the colours and the emission line equivalent widths of the red quasars can be explained by the addition of a featureless red synchrotron continuum component to an otherwise normal blue quasar spectrum. The red synchrotron component must have a spectrum at least as red as a power-law of the form F υ α υ −2.8 . The relative strengths of the blue and red components span two orders of magnitude at rest-frame 500 nm. The blue component is weaker relative to the red component in low optical luminosity sources. This suggests that the fraction of accretion energy going into optical emission from the jet is greater in lowluminosity quasars. This correlation between colour and luminosity may be of use in cosmological distance scale work. This synchrotron model does not, however, fit ˜10% of the quasars, which have both red colours and high equivalent width emission lines.We hypothesise that these red, strong-lined quasars have intrinsically weak Big Blue Bumps. There is no discontinuity in spectral properties between the BL Lac objects in our s le and the other quasars. BL Lac objects appear to be the red, low equivalent width tail of a continuous distribution. The synchrotron emission component only dominates the spectrum at longer wavelengths, so existing BL Lac surveys will be biased against high redshift objects. This will affect measurements of BL Lac evolution. The blue PHFS quasars have significantly higher equivalent width C IV, Hβ and [O III] emission than a matched s le of optically selected QSOs.
HIPASS Detection of an Intergalactic Gas Cloud in the NGC 2442 Group
Publisher: American Astronomical Society
Date: 07-2001
DOI: 10.1086/321453
On star formation and the nonexistence of dark galaxies
Publisher: American Astronomical Society
Date: 12-2005
DOI: 10.1086/497158
Predicting caustic-crossing high-magnification events in Q2237+0305
Publisher: Oxford University Press (OUP)
Date: 11-11-2000
DIVISION VIII: GALAXIES AND THE UNIVERSE
Publisher: Cambridge University Press (CUP)
Date: 12-2007
DOI: 10.1017/S1743921308024010
Abstract: Division VIII gathers astronomers engaged in the study of the visible and invisible matter in the Universe at large, from Local Group galaxies via distant galaxies and galaxy clusters to the large-scale structure of the Universe and the cosmic background radiation.
Quasar - galaxy associations
Publisher: Oxford University Press (OUP)
Date: 15-04-1995
Robust statistics towards detection of the 21 cm signal from the Epoch of Reionization
Publisher: Oxford University Press (OUP)
Date: 17-05-2010
Economic Performance Indicators for a Geothermal Aquatic Center in Victoria, Australia
Publisher: MDPI AG
Date: 22-02-2023
DOI: 10.3390/EN16052134
Abstract: The Gippsland Regional Aquatic Centre (GRAC) opened in the town of Traralgon, Victoria, Australia early in 2021. The GRAC utilizes a geothermal energy heating system as an alternative to conventional natural gas furnaces. We have examined 12 full months of heat production from the geothermal system of the GRAC and compared its economic performance against equivalent heat production by natural gas. The geothermal system—the first of its kind in Victoria—operated at % availability over its first year of operation. Our economic assessment indicates that the breakeven price for the geothermal energy is about 35% the equivalent price of natural gas and the payback period for the geothermal system is about five years. The results justify the initial capital outlay by Latrobe City Council and are likely to stimulate further development of geothermal heat systems in the region.
Detection of statistical gravitational lensing by foreground mass distributions
Publisher: Springer Science and Business Media LLC
Date: 11-1988
DOI: 10.1038/336358A0
Near-identical star formation rate densities from Hα and FUV at redshift zero
Publisher: Oxford University Press (OUP)
Date: 12-06-2018
Optical Searches for Gravitational Lenses
Publisher: Springer Berlin Heidelberg
Date: 1989
Using galaxy redshift surveys to detect gravitationally lensed quasars
Publisher: Oxford University Press (OUP)
Date: 04-04-2000
The Clustering of AGN[CLC]s[/CLC] and Galaxies at Intermediate Redshift
Publisher: American Astronomical Society
Date: 07-2001
DOI: 10.1086/321106
The Phase II Murchison Widefield Array: Design overview
Publisher: Cambridge University Press (CUP)
Date: 2018
DOI: 10.1017/PASA.2018.37
Abstract: We describe the motivation and design details of the ‘Phase II’ upgrade of the Murchison Widefield Array radio telescope. The expansion doubles to 256 the number of antenna tiles deployed in the array. The new antenna tiles enhance the capabilities of the Murchison Widefield Array in several key science areas. Seventy-two of the new tiles are deployed in a regular configuration near the existing array core. These new tiles enhance the surface brightness sensitivity of the array and will improve the ability of the Murchison Widefield Array to estimate the slope of the Epoch of Reionisation power spectrum by a factor of ∼3.5. The remaining 56 tiles are deployed on long baselines, doubling the maximum baseline of the array and improving the array u, v coverage. The improved imaging capabilities will provide an order of magnitude improvement in the noise floor of Murchison Widefield Array continuum images. The upgrade retains all of the features that have underpinned the Murchison Widefield Array’s success (large field of view, snapshot image quality, and pointing agility) and boosts the scientific potential with enhanced imaging capabilities and by enabling new calibration strategies.
Evidence for a large undetected population of dust-reddened quasars
Publisher: Springer Science and Business Media LLC
Date: 06-1995
DOI: 10.1038/375469A0
A New Wide-Separation Gravitational Lens Candidate
Publisher: American Astronomical Society
Date: 11-1989
DOI: 10.1086/185579
In situ measurement of MWA primary beam variation using ORBCOMM
Publisher: Cambridge University Press (CUP)
Date: 2018
DOI: 10.1017/PASA.2018.30
Abstract: We provide the first in situ measurements of antenna element beam shapes of the Murchison Widefield Array. Most current processing pipelines use an assumed beam shape, which can cause absolute and relative flux density errors and polarisation ‘leakage’. Understanding the primary beam is then of paramount importance, especially for sensitive experiments such as a measurement of the 21-cm line from the epoch of reionisation, where the calibration requirements are so extreme that tile to tile beam variations may affect our ability to make a detection. Measuring the primary beam shape from visibilities is challenging, as multiple instrumental, atmospheric, and astrophysical factors contribute to uncertainties in the data. Building on the methods of Neben et al. [Radio Sci., 50, 614], we tap directly into the receiving elements of the telescope before any digitisation or correlation of the signal. Using ORBCOMM satellite passes we are able to produce all-sky maps for four separate tiles in the XX polarisation. We find good agreement with the beam model of Sokolowski et al. [2017, PASA, 34, e062], and clearly observe the effects of a missing dipole from a tile in one of our beam maps. We end by motivating and outlining additional on-site experiments.
The intrinsic far-UV spectrum of the high-redshift quasar B1422+231
Publisher: Oxford University Press (OUP)
Date: 09-10-2018
The Northern HIPASS catalogue - Data presentation, completeness and reliability measures
Publisher: Oxford University Press (OUP)
Date: 10-2006
Investigating cosmological weak lensing with the ray-bundle method
Publisher: Oxford University Press (OUP)
Date: 03-2002
The survey for ionization in neutral gas galaxies. III. Diffuse, warm ionized medium and escape of ionizing radiation
Publisher: American Astronomical Society
Date: 06-2007
DOI: 10.1086/517867
The Parkes 21 cm multibeam receiver
Publisher: Cambridge University Press (CUP)
Date: 06-1996
DOI: 10.1017/S1323358000020919
Abstract: Several extragalactic H I surveys using a λ 21 cm 13-beam focal plane array will begin in early 1997 using the Parkes 64 m telescope. These surveys are designed to detect efficiently nearby galaxies that have failed to be identified optically because of low optical surface brightness or high optical extinction. We discuss scientific and technical aspects of the multibeam receiver, including astronomical objectives, feed, receiver and correlator design and data acquisition. A comparison with other telescopes shows that the Parkes multibeam receiver has significant speed advantages for any large-area λ 21 cm galaxy survey in the velocity range range 0–14000 km s −1 .
An Extragalactic H [CSC]i[/CSC] Cloud with No Optical Counterpart?
Publisher: American Astronomical Society
Date: 09-2000
DOI: 10.1086/301542
The survey for ionization in neutral gas galaxies. I. Description and initial results
Publisher: American Astronomical Society
Date: 07-2006
DOI: 10.1086/504685
The survey for ionization in neutral gas galaxies. II. The star formation rate density of the local universe
Publisher: American Astronomical Society
Date: 20-09-2006
DOI: 10.1086/504681
Gridded and direct Epoch of Reionisation bispectrum estimates using the Murchison Widefield Array
Publisher: Cambridge University Press (CUP)
Date: 2019
DOI: 10.1017/PASA.2019.15
Abstract: We apply two methods to estimate the 21-cm bispectrum from data taken within the Epoch of Reionisation (EoR) project of the Murchison Widefield Array (MWA). Using data acquired with the Phase II compact array allows a direct bispectrum estimate to be undertaken on the multiple redundantly spaced triangles of antenna tiles, as well as an estimate based on data gridded to the uv -plane. The direct and gridded bispectrum estimators are applied to 21 h of high-band (167–197 MHz z = 6.2–7.5) data from the 2016 and 2017 observing seasons. Analytic predictions for the bispectrum bias and variance for point-source foregrounds are derived. We compare the output of these approaches, the foreground contribution to the signal, and future prospects for measuring the bispectra with redundant and non-redundant arrays. We find that some triangle configurations yield bispectrum estimates that are consistent with the expected noise level after 10 h, while equilateral configurations are strongly foreground-dominated. Careful choice of triangle configurations may be made to reduce foreground bias that hinders power spectrum estimators, and the 21-cm bispectrum may be accessible in less time than the 21-cm power spectrum for some wave modes, with detections in hundreds of hours.
Occultations by Kuiper belt objects
Publisher: Oxford University Press (OUP)
Date: 08-1997
Initial light curve of Q2237+0305
Publisher: American Astronomical Society
Date: 07-1991
DOI: 10.1086/115856
A high reliability survey of discrete Epoch of Reionization foreground sources in the MWA EoR0 field
Publisher: Oxford University Press (OUP)
Date: 08-07-2016
A Matched Filter Technique for Slow Radio Transient Detection and First Demonstration with the Murchison Widefield Array
Publisher: American Astronomical Society
Date: 07-02-2017
The High Time and Frequency Resolution Capabilities of the Murchison Widefield Array
Publisher: Cambridge University Press (CUP)
Date: 2015
DOI: 10.1017/PASA.2015.6
Abstract: The science cases for incorporating high time resolution capabilities into modern radio telescopes are as numerous as they are compelling. Science targets range from exotic sources such as pulsars, to our Sun, to recently detected possible extragalactic bursts of radio emission, the so-called fast radio bursts (FRBs). Originally conceived purely as an imaging telescope, the initial design of the Murchison Widefield Array (MWA) did not include the ability to access high time and frequency resolution voltage data. However, the flexibility of the MWA’s software correlator allowed an off-the-shelf solution for adding this capability. This paper describes the system that records the 100 μs and 10 kHz resolution voltage data from the MWA. Ex le science applications, where this capability is critical, are presented, as well as accompanying commissioning results from this mode to demonstrate verification.
Overcoming real-world obstacles in 21 cm power spectrum estimation: A method demonstration and results from early Murchison Widefield Array data
Publisher: American Physical Society (APS)
Date: 15-01-2014
The Murchison Widefield Array Correlator
Publisher: Cambridge University Press (CUP)
Date: 2015
DOI: 10.1017/PASA.2015.5
Abstract: The Murchison Widefield Array is a Square Kilometre Array Precursor. The telescope is located at the Murchison Radio–astronomy Observatory in Western Australia. The MWA consists of 4 096 dipoles arranged into 128 dual polarisation aperture arrays forming a connected element interferometer that cross-correlates signals from all 256 inputs. A hybrid approach to the correlation task is employed, with some processing stages being performed by bespoke hardware, based on Field Programmable Gate Arrays, and others by Graphics Processing Units housed in general purpose rack mounted servers. The correlation capability required is approximately 8 tera floating point operations per second. The MWA has commenced operations and the correlator is generating 8.3 TB day −1 of correlation products, that are subsequently transferred 700 km from the MRO to Perth (WA) in real-time for storage and offline processing. In this paper, we outline the correlator design, signal path, and processing elements and present the data format for the internal and external interfaces.
Microlensing constraints on broad absorption and emission line flows in the quasar H1413+117
Publisher: American Astronomical Society
Date: 28-10-2015
NGC 922 - a new drop-through ring galaxy★
Publisher: Oxford University Press (OUP)
Date: 07-07-2006
The 154 MHz radio sky observed by the Murchison Widefield Array: Noise, confusion, and first source count analyses
Publisher: Oxford University Press (OUP)
Date: 12-04-2016
DOI: 10.1093/MNRAS/STW823
The statistics of wide-separation lensed quasars
Publisher: Oxford University Press (OUP)
Date: 04-04-2000
Evidence for a nonuniform initial mass function in the local universe
Publisher: American Astronomical Society
Date: 04-2009
The rate of caustic crossing microlensing events for Q2237+0305
Publisher: Oxford University Press (OUP)
Date: 21-06-2000
Dissecting a galaxy: mass distribution of 2237+0305
Publisher: Oxford University Press (OUP)
Date: 11-08-2002
Investigating the geometry of quasars with microlensing
Publisher: Oxford University Press (OUP)
Date: 1999
Evolution and gravitational lensing in quasar absorption line systems
Publisher: Springer Berlin Heidelberg
Date: 1990
DOI: 10.1007/BFB0009244
Gravitational Lens Candidates in the HST Survey of BL Lac Objects
Publisher: Springer Science and Business Media LLC
Date: 1999
Direct shear mapping – a new weak lensing tool
Publisher: Oxford University Press (OUP)
Date: 11-06-2015
Dust obscured Quasars
Publisher: Springer Netherlands
Date: 1996
Near-infrared Hydrogen and Helium QSO Emission Lines
Publisher: American Astronomical Society
Date: 03-09-2019
A small source in Q2237+0305?
Publisher: Oxford University Press (OUP)
Date: 11-2000
Near infrared hydrogen emission line ratios as diagnostics of the broad emission line region
Publisher: IOP Publishing
Date: 30-07-2012
The ray-bundle method for calculating weak magnification by gravitational lenses
Publisher: Oxford University Press (OUP)
Date: 07-1999
Evolution of damped Lyman α kinematics and the effect of spatial resolution on 21-cm measurements
Publisher: Oxford University Press (OUP)
Date: 11-2005
Associations between galaxies and bright quasars.
Publisher: Cambridge University Press (CUP)
Date: 1992
DOI: 10.1017/S1323358000019111
Abstract: The results of a new imaging survey of 68 bright ( m v 18) high redshift ( z 0.7) quasars are presented. The distribution of celestial distances between the quasars and the nearest galaxy neighbours shows an excess at small separations ( 15 arcseconds) significant at the 99.96% level. The redshifts of these galaxies are not known, so two interpretations are possible. If the galaxies are in groups physically associated with the quasars then they must be significantly brighter ( 3 magnitudes) than normal M * galaxies at the present epoch. Alternatively, this may be the result of a bias caused by gravitational lification of background quasars by compact lenses in the halos of the nearest neighbour (foreground) galaxies. Of the present s le, 25% of the quasars have extra galaxies. If this is caused by a gravitational lensing bias, then, allowing for incompleteness, the results imply that as many as 60% of bright quasars may be gravitationally lensed.
Gravitational lensing and evolution in quasar absorption systems
Publisher: American Astronomical Society
Date: 02-1990
DOI: 10.1086/168327
The Local Large-Scale Structure from HIPASS
Publisher: Cambridge University Press (CUP)
Date: 2005
DOI: 10.1017/S0074180900196639
Abstract: The HI Parkes All Sky Survey (HIPASS) offers a unique perspective on the galaxy population in the local universe. A catalogue of 4315 HI-selected galaxies has been extracted from the southern region of the survey (δ +2°). This catalogue gives a clear view of the local large-scale structure and is used to study the two-point correlation function, the Tully-Fisher relation, and galaxy luminosity and mass functions. Some initial results are discussed here.
NOIRCAT - The Northern HIPASS Optical/IR Catalogue
Publisher: Oxford University Press (OUP)
Date: 11-11-2009
Wavelet-based Characterization of Small-scale Solar Emission Features at Low Radio Frequencies
Publisher: American Astronomical Society
Date: 27-06-2017
On the nature of MG II absorption line systems in quasars
Publisher: American Astronomical Society
Date: 09-1993
DOI: 10.1086/116689
The HIPASS catalogue: H I and environmental effects on the H I mass function of galaxies
Publisher: Oxford University Press (OUP)
Date: 05-2005
Photometric Monitoring of 2237+0305
Publisher: Springer-Verlag
Date: 1990
DOI: 10.1007/BFB0009257
A Photographic Search for Satellites of Uranus
Publisher: Elsevier BV
Date: 04-1993
The HIPASS catalogue - III. Optical counterparts and isolated dark galaxies
Publisher: Oxford University Press (OUP)
Date: 07-2005
Einstein Ring Constraints on the Shapes of Dark Matter Haloes
Publisher: Cambridge University Press (CUP)
Date: 07-2005
The multiple quasar Q2237+0305 under a microlensing caustic
Publisher: EDP Sciences
Date: 02-01-2008
The northern HIPASS optical/IR catalogue (NOIRCAT)
Publisher: Cambridge University Press (CUP)
Date: 06-2007
DOI: 10.1017/S1743921307014421
Abstract: We present the Northern HIPASS Optical/Infrared Catalogue (NOIRCAT), an optical/near-infrared counterpart catalogue for the Northern HIPASS catalogue (NHICAT). Of the 1002 sources in NHICAT, 655 (66%) have optical counterparts with matching optical velocities. A further 87 sources have optical counterparts with matching velocities from previous radio emission line surveys. Assuming a dark galaxy to be an isolated H I source with no detectable stars, no candidate dark galaxies have been confirmed.
Galactic Recycling: The HI Ring Around NGC 1533
Publisher: Springer Netherlands
Date: 2003
The fundamental manifold of spiral galaxies: ordered versus random motions and the morphology dependence of the Tully-Fisher relation
Publisher: Oxford University Press (OUP)
Date: 28-01-2014
CHIPS: THE COSMOLOGICAL H i POWER SPECTRUM ESTIMATOR
Publisher: American Astronomical Society
Date: 18-02-2016
THE MURCHISON WIDEFIELD ARRAY 21 cm POWER SPECTRUM ANALYSIS METHODOLOGY
Publisher: American Astronomical Society
Date: 11-07-2016
New Galaxies Discovered in the First Blind Hi Survey of the Centaurus A Group
Publisher: American Astronomical Society
Date: 20-10-1999
DOI: 10.1086/307854
Near infrared micro-variability of radio-loud quasars
Publisher: Cambridge University Press (CUP)
Date: 2002
DOI: 10.1071/AS01083
Abstract: We observed three AGN from the Parkes Half-Jansky Flat-spectrum S le at near infrared (NIR) wavelengths to search for micro-variability. In one source, the blue quasar PKS 2243–123, good evidence for NIR micro-variability was found. In the other two sources, PKS 2240–260 and PKS 2233–148, both BL Lacertae objects, no such evidence of variability was detected. We discuss the implications of these observations for the various mechanisms that have been proposed for micro-variability.
PUMA: The Positional Update and Matching Algorithm
Publisher: Cambridge University Press (CUP)
Date: 2017
DOI: 10.1017/PASA.2016.58
Abstract: We present new software to cross-match low-frequency radio catalogues: the Positional Update and Matching Algorithm. The Positional Update and Matching Algorithm combines a positional Bayesian probabilistic approach with spectral matching criteria, allowing for confusing sources in the matching process. We go on to create a radio sky model using Positional Update and Matching Algorithm based on the Murchison Widefield Array Commissioning Survey, and are able to automatically cross-match ~ 98.5% of sources. Using the characteristics of this sky model, we create simple simulated mock catalogues on which to test the Positional Update and Matching Algorithm, and find that Positional Update and Matching Algorithm can reliably find the correct spectral indices of sources, along with being able to recover ionospheric offsets. Finally, we use this sky model to calibrate and remove foreground sources from simulated interferometric data, generated using OSKAR (the Oxford University visibility generator). We demonstrate that there is a substantial improvement in foreground source removal when using higher frequency and higher resolution source positions, even when correcting positions by an average of 0.3 arcmin given a synthesised beam-width of ~ 2.3 arcmin.
Limits on Fast Radio Bursts and other transient sources at 182 MHz using the Murchison Widefield Array
Publisher: Oxford University Press (OUP)
Date: 03-2016
DOI: 10.1093/MNRAS/STW451
Memory on multiple time-scales in an Abelian sandpile
Publisher: Elsevier BV
Date: 06-2015
Exploring reionization and high-z galaxy observables with recent multiredshift MWA upper limits on the 21-cm signal
Publisher: Oxford University Press (OUP)
Date: 13-11-2020
Abstract: We use the latest multiredshift (z = 6.5−8.7) upper limits on the 21-cm signal from the Murchison Widefield Array (MWA) to explore astrophysical models which are inconsistent with the data. We explore these limits in the context of reionization astrophysics by using 21CMMC to connect the disfavoured regions of parameter space to existing observational constraints on reionization such as high-z galaxy ultraviolet (UV) luminosity functions, the background UV photoionization rate, the intergalactic medium (IGM) neutral fraction, the electron scattering optical depth and the soft-band X-ray emissivity. We find the vast majority of disfavoured models to already be inconsistent with existing observational constraints. These can be broadly classified into two types of models: (i) ‘cold’ reionization and (ii) pure matter density fluctuations in a cold, neutral IGM (i.e. no reionization). Interestingly, a small subs le of models inconsistent with the MWA is consistent with the aforementioned constraints (excluding the X-ray emissivity). This implies that the current MWA limits are already providing unique information to disfavour models of reionization, albeit extremely weakly. We also provide the first limits on the soft-band X-ray emissivity from galaxies at high redshifts, finding 1σ lower limits of ϵX, 0.5−2 keV ≳ 1034.5 erg s−1 Mpc−3. Finally, we recover 95 per cent disfavoured limits on the IGM spin temperature of $\\bar{T}_{\\rm S}\\lesssim$ 1.3, 1.4, 1.5, 1.8, 2.1, and 2.4 K at z = 6.5, 6.8, 7.1, 7.8, 8.2, and 8.7. With this, we infer the IGM must have undergone, at the very least, a small amount of X-ray heating. Note, the limits on ϵX, 0.5–2 keV and $\\bar{T}_{\\rm S}$ are conditional on the IGM neutral fraction.
ON THE DETECTION AND TRACKING OF SPACE DEBRIS USING THE MURCHISON WIDEFIELD ARRAY. I. SIMULATIONS AND TEST OBSERVATIONS DEMONSTRATE FEASIBILITY
Publisher: American Astronomical Society
Date: 16-09-2013
Is there evidence for universal rotation?
Publisher: Springer Science and Business Media LLC
Date: 02-1983
DOI: 10.1038/301735A0
Choirs, H i galaxy groups: catalogue and detection of star-forming dwarf group members
Publisher: Oxford University Press (OUP)
Date: 21-05-2013
DOI: 10.1093/MNRAS/STT747
A Search for Distant Satellites of Neptune
Publisher: Cambridge University Press (CUP)
Date: 1998
DOI: 10.1071/AS98325
Abstract: The recent discovery of two distant satellites of Uranus suggests that there could be similar bodies orbiting Neptune. Previous surveys for distant satellites of Neptune have had relatively bright magnitude limits ( B J ≃ 20·5) and would have missed satellites with magnitudes and colours similar to the two recently discovered Uranian satellites ( R ~ 20·4 and R ~ 21·9). We have searched for satellites of Neptune to a limiting magnitude of R ~ 21 in a 0·1□° region centred on the planet. This search is up to ~ 2 magnitudes deeper than the previous wide field search for distant satellites by the UK Schmidt Telescope. Nereid was easily recovered by the search and no large variations of its magnitude were detected.
Interpretation of the OGLE Q2237+0305 microlensing light curve (1997-1999)
Publisher: Oxford University Press (OUP)
Date: 11-11-2000
Red synchrotron jets in Parkes quasars
Publisher: Oxford University Press (OUP)
Date: 21-05-2001
Photometric Variations in the Q2237+0305 System: First Detection of a Microlensing Event
Publisher: American Astronomical Society
Date: 12-1989
DOI: 10.1086/115272
Low Altitude Solar Magnetic Reconnection, Type III Solar Radio Bursts, and X-ray Emissions
Publisher: Springer Science and Business Media LLC
Date: 26-01-2018
DOI: 10.1038/S41598-018-19195-3
Abstract: Type III solar radio bursts are the Sun’s most intense and frequent nonthermal radio emissions. They involve two critical problems in astrophysics, plasma physics, and space physics: how collective processes produce nonthermal radiation and how magnetic reconnection occurs and changes magnetic energy into kinetic energy. Here magnetic reconnection events are identified definitively in Solar Dynamics Observatory UV-EUV data, with strong upward and downward pairs of jets, current sheets, and cusp-like geometries on top of time-varying magnetic loops, and strong outflows along pairs of open magnetic field lines. Type III bursts imaged by the Murchison Widefield Array and detected by the Learmonth radiospectrograph and STEREO B spacecraft are demonstrated to be in very good temporal and spatial coincidence with specific reconnection events and with bursts of X-rays detected by the RHESSI spacecraft. The reconnection sites are low, near heights of 5–10 Mm. These images and event timings provide the long-desired direct evidence that semi-relativistic electrons energized in magnetic reconnection regions produce type III radio bursts. Not all the observed reconnection events produce X-ray events or coronal or interplanetary type III bursts thus different special conditions exist for electrons leaving reconnection regions to produce observable radio, EUV, UV, and X-ray bursts.
The Kinematics of Quasar Broad Emission Line Regions Using a Disk-Wind Model
Publisher: Cambridge University Press (CUP)
Date: 2017
DOI: 10.1017/PASA.2017.37
Abstract: The structure and kinematics of the broad line region in quasars are still unknown. One popular model is the disk-wind model that offers a geometric unification of a quasar based on the viewing angle. We construct a simple kinematical disk-wind model with a narrow outflowing wind angle. The model is combined with radiative transfer in the Sobolev, or high velocity, limit. We examine how angle of viewing affects the observed characteristics of the emission line. The line profiles were found to exhibit distinct properties depending on the orientation, wind opening angle, and region of the wind where the emission arises. At low inclination angle (close to face-on), we find that the shape of the emission line is asymmetric, narrow, and significantly blueshifted. As the inclination angle increases (close to edge-on), the line profile becomes more symmetric, broader, and less blueshifted. Additionally, lines that arise close to the base of the disk wind, near the accretion disk, tend to be broad and symmetric. Single-peaked line profiles are recovered for the intermediate and equatorial wind. The model is also able to reproduce a faster response in either the red or blue sides of the line profile, consistent with reverberation mapping studies.
Quasar-Galaxy Associations
Publisher: Springer-Verlag
Date: 1990
DOI: 10.1007/BFB0009236
An Automated Survey for Gravitational Lenses
Publisher: American Astronomical Society
Date: 1988
DOI: 10.1086/114608
CONFIRMATION OF WIDE-FIELD SIGNATURES IN REDSHIFTED 21 cm POWER SPECTRA
Publisher: American Astronomical Society
Date: 10-07-2015
The Murchison Widefield Array Transients Survey (MWATS). A search for low frequency variability in a bright Southern hemisphere sample
Publisher: Oxford University Press (OUP)
Date: 18-10-2018
The HI Content of Compact Groups of Galaxies
Publisher: Cambridge University Press (CUP)
Date: 2004
DOI: 10.1071/AS03048
Abstract: The H I content of Hickson Compact Groups in the southern hemisphere is measured using data from the H I Parkes All-Sky Survey (HIPASS), and dedicated observations using the narrow band filter on the Multibeam instrument on the Parkes telescope. The expected H I mass of these groups was estimated using the luminosity, diameter, and morphological types of the member galaxies, calibrated from published data. Taking careful account of non-detection limits, the results show that the compact group population that has been detected by these observations has an H I content similar to that of galaxies in the reference field s le. The upper limits for the undetected groups lie within the normal range improvement of these limits will require a large increase in sensitivity.
Evidence for an intermediate-mass black hole from a gravitationally lensed gamma-ray burst
Publisher: Springer Science and Business Media LLC
Date: 29-03-2021
Parametrizing Epoch of Reionization foregrounds: a deep survey of low-frequency point-source spectra with the Murchison Widefield Array
Publisher: Oxford University Press (OUP)
Date: 11-02-2016
DOI: 10.1093/MNRAS/STW310
Ionospheric Modelling using GPS to Calibrate the MWA. I: Comparison of First Order Ionospheric Effects between GPS Models and MWA Observations
Publisher: Cambridge University Press (CUP)
Date: 2015
DOI: 10.1017/PASA.2015.29
Abstract: We compare first-order (refractive) ionospheric effects seen by the MWA with the ionosphere as inferred from GPS data. The first-order ionosphere manifests itself as a bulk position shift of the observed sources across an MWA field of view. These effects can be computed from global ionosphere maps provided by GPS analysis centres, namely the CODE. However, for precision radio astronomy applications, data from local GPS networks needs to be incorporated into ionospheric modelling. For GPS observations, the ionospheric parameters are biased by GPS receiver instrument delays, among other effects, also known as receiver DCBs. The receiver DCBs need to be estimated for any non-CODE GPS station used for ionosphere modelling. In this work, single GPS station-based ionospheric modelling is performed at a time resolution of 10 min. Also the receiver DCBs are estimated for selected Geoscience Australia GPS receivers, located at Murchison Radio Observatory, Yarragadee, Mount Magnet and Wiluna. The ionospheric gradients estimated from GPS are compared with that inferred from MWA. The ionospheric gradients at all the GPS stations show a correlation with the gradients observed with the MWA. The ionosphere estimates obtained using GPS measurements show promise in terms of providing calibration information for the MWA.
GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey
Publisher: Cambridge University Press (CUP)
Date: 2015
DOI: 10.1017/PASA.2015.26
Abstract: GLEAM, the GaLactic and Extragalactic All-sky MWA survey, is a survey of the entire radio sky south of declination + 25° at frequencies between 72 and 231 MHz, made with the MWA using a drift scan method that makes efficient use of the MWA’s very large field-of-view. We present the observation details, imaging strategies, and theoretical sensitivity for GLEAM. The survey ran for two years, the first year using 40-kHz frequency resolution and 0.5-s time resolution the second year using 10-kHz frequency resolution and 2 s time resolution. The resulting image resolution and sensitivity depends on observing frequency, sky pointing, and image weighting scheme. At 154 MHz, the image resolution is approximately 2.5 × 2.2/cos (δ + 26.7°) arcmin with sensitivity to structures up to ~ 10° in angular size. We provide tables to calculate the expected thermal noise for GLEAM mosaics depending on pointing and frequency and discuss limitations to achieving theoretical noise in Stokes I images. We discuss challenges, and their solutions, that arise for GLEAM including ionospheric effects on source positions and linearly polarised emission, and the instrumental polarisation effects inherent to the MWA’s primary beam.
The 1000 brightest hipass galaxies: H I Properties
Publisher: American Astronomical Society
Date: 07-2004
DOI: 10.1086/421744
Stars and dark matter in the spiral gravitational lens 2237+0305
Publisher: Oxford University Press (OUP)
Date: 21-01-2010
A catalog of H I-selected galaxies from the south celestial cap region of sky
Publisher: American Astronomical Society
Date: 08-2002
DOI: 10.1086/341582
The 1000 brightest HIPASS galaxies: The H I mass function and ω H I
Publisher: American Astronomical Society
Date: 06-2003
DOI: 10.1086/374944
Soft X-ray absorption in Parkes quasars
Publisher: Wiley
Date: 08-1999
DOI: 10.1002/1521-3994(199908)320:4/5<320::AID-ASNA320>3.0.CO;2-J
AllBRICQS: The All-sky BRIght, Complete Quasar Survey
Publisher: Cambridge University Press (CUP)
Date: 2023
DOI: 10.1017/PASA.2023.7
Abstract: We describe the first results from the All-sky BRIght, Complete Quasar Survey (AllBRICQS), which aims to discover the last remaining optically bright quasars. We present 156 spectroscopically confirmed quasars (140 newly identified) having $|b| ^{\circ}$ . 152 of the quasars have Gaia DR3 magnitudes brighter than $B_{P}=16.5$ or $R_{P}=16$ mag, while four are slightly fainter. The quasars span a redshift range of $z=0.07-3.93$ . In particular, we highlight the properties of J0529-4351 at $z=3.93$ , which, if unlensed, is one of the most intrinsically luminous quasars in the Universe. The AllBRICQS sources have been selected by combining data from the Gaia and WISE all-sky satellite missions, and we successfully identify quasars not flagged as candidates by Gaia Data Release 3. We expect the completeness to be $\approx$ 96% within our magnitude and latitude limits, while the preliminary results indicate a selection purity of $\approx$ 96%. The optical spectroscopy used for source classification will also enable detailed quasar characterisation, including black hole mass measurements and identification of foreground absorption systems. The AllBRICQS sources will greatly enhance the number of quasars available for high-signal-to-noise follow-up with present and future facilities.
DELAY SPECTRUM WITH PHASE-TRACKING ARRAYS: EXTRACTING THE H i POWER SPECTRUM FROM THE EPOCH OF REIONIZATION
Publisher: American Astronomical Society
Date: 19-12-2016
Red Parkes Quasars: Evidence for Soft X-Ray Absorption
Publisher: American Astronomical Society
Date: 10-01-1999
DOI: 10.1086/306611
Commission 47: Cosmology
Publisher: Cambridge University Press (CUP)
Date: 12-2005
DOI: 10.1017/S1743921306004728
Abstract: 2002–2005 has seen rapid progress in cosmology with the publication of the 1st year WMAP results and analyses of large scale red-shift surveys, ushering in an era of “precision cosmology”. There has been steady progress, too, in the discovery and study of quasars and galaxies in the early Universe.
An H I survey for protogalaxies in the Centaurus and Fornax galaxy clusters
Publisher: Oxford University Press (OUP)
Date: 21-06-1997
Direct Shear Mapping: Prospects for Weak Lensing Studies of Individual Galaxy–Galaxy Lensing Systems
Publisher: Cambridge University Press (CUP)
Date: 2015
DOI: 10.1017/PASA.2015.39
Abstract: Using both a theoretical and an empirical approach, we have investigated the frequency of low redshift galaxy-galaxy lensing systems in which the signature of 3D weak lensing might be directly detectable. We find good agreement between these two approaches. Using data from the Galaxy and Mass Assembly redshift survey we estimate the frequency of detectable weak lensing at low redshift. We find that below a redshift of z ~ 0.6, the probability of a galaxy being weakly lensed by γ ⩾ 0.02 is ~ 0.01. We have also investigated the feasibility of measuring the scatter in the M * − M h relation using shear statistics. We estimate that for a shear measurement error of Δγ = 0.02 (consistent with the sensitivity of the Direct Shear Mapping technique), with a s le of ~$50,000 spatially and spectrally resolved galaxies, the scatter in the M * − M h relation could be measured. While there are currently no existing IFU surveys of this size, there are upcoming surveys that will provide this data (e.g The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX), surveys with Hector, and the Square Kilometre Array (SKA)).
Dust-reddened quasars
Publisher: Cambridge University Press (CUP)
Date: 05-1996
DOI: 10.1017/S1323358000020774
Abstract: We have recently discovered evidence for a population of radio-loud quasars that is reddened by dust. The dust is either along the line of sight to the quasars or is associated with the quasars. In the latter case the dust may be in molecular clouds in the quasar’s host galaxy, or in a molecular torus around the nucleus. We are planning to use 3 mm observations to search for molecular absorption lines (CO and HCO + ) associated with dust at the redshift of these quasars. If any absorption systems are detected we will be able to deduce detailed information about the physical state of the molecular gas, hopefully showing which of the proposed locations of the dust is most likely.
Binary quasars
Publisher: Oxford University Press (OUP)
Date: 11-11-1999
An analysis of the halo and relic radio emission from Abell 3376 from Murchison Widefield Array observations
Publisher: Oxford University Press (OUP)
Date: 30-06-2015
Cosmology: Views with a gravitational lens
Publisher: Springer Science and Business Media LLC
Date: 12-1986
DOI: 10.1038/324617A0
The Evolution of Radio Galaxies at Intermediate Redshift
Publisher: American Astronomical Society
Date: 05-2001
DOI: 10.1086/320410
Changing look active galactic nuclei in the MaNGA survey
Publisher: Oxford University Press (OUP)
Date: 07-07-2020
Abstract: Changing look active galactic nuclei (CLAGNs) are rare cases of AGNs, where the continuum flux increases/decreases and the broad emission lines appear/disappear within short time-scales. These extreme changes challenge our understanding of accretion disc dynamics. We present a s le of four new CLAGNs at 0.026 & z & 0.107, which were found by cross-matching the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey with AGNs from the SDSS spectroscopic data base. Our results show that the selection criteria of $\gt \mathopen |0.5\mathclose |$ mag change in SDSS-g band is ineffective at lower redshifts. This is, in part, due to the fact that the g band is probing a different part of the AGNs spectral energy distribution at these redshifts. The bigger issue is that the galaxy continuum dominates the spectrum and thus overwhelms any variation of the AGNs continuum that might contribute to photometric variations. This suggests the need to use different methods for future low-redshift CLAGNs searches.
The 1000 brightest HIPASS galaxies: Newly cataloged galaxies
Publisher: American Astronomical Society
Date: 10-2002
DOI: 10.1086/342546
The column density distribution function at z = 0 from HI selected galaxies
Publisher: Oxford University Press (OUP)
Date: 21-08-2003
Preliminary radio continuum maps of three spiral galaxies
Publisher: Cambridge University Press (CUP)
Date: 05-1996
DOI: 10.1017/S1323358000020646
Abstract: The Australia Telescope Compact Array has been used in two 6 km configurations to make 12 hour observations of the radio continuum structure of three spiral galaxies at 1380 MHz and 2378 MHz. Radio maps of NGC 1792, 6300 and 1097 are presented here, as part of a survey to find ex les of anomalous radio structures in spiral galaxies.
The Parkes half-jansky flat-spectrum sample
Publisher: Oxford University Press (OUP)
Date: 1997
The large-scale distribution of neutral hydrogen in the Fornax region
Publisher: Oxford University Press (OUP)
Date: 09-2002
A Large-Scale, Low-Frequency Murchison Widefield Array Survey of Galactic H ii Regions between 260 < l < 340
Publisher: Cambridge University Press (CUP)
Date: 2016
DOI: 10.1017/PASA.2016.19
Abstract: We have compiled a catalogue of H ii regions detected with the Murchison Widefield Array between 72 and 231 MHz. The multiple frequency bands provided by the Murchison Widefield Array allow us identify the characteristic spectrum generated by the thermal Bremsstrahlung process in H ii regions. We detect 306 H ii regions between 260° l 340° and report on the positions, sizes, peak, integrated flux density, and spectral indices of these H ii regions. By identifying the point at which H ii regions transition from the optically thin to thick regime, we derive the physical properties including the electron density, ionised gas mass, and ionising photon flux, towards 61 H ii regions. This catalogue of H ii regions represents the most extensive and uniform low frequency survey of H ii regions in the Galaxy to date.
Results from the MWA EoR Experiment
Publisher: Cambridge University Press (CUP)
Date: 10-2017
DOI: 10.1017/S1743921318000893
Abstract: The MWA EoR is one of a small handful of experiments designed to detect the statistical signal from the Epoch of Reionisation. Each of these experiments has reached a level of maturity, where the challenges, in particular of foreground removal, are being more fully understood. Over the past decade, the MWA EoR Collaboration has developed expertise and an understanding of the elements of the telescope array, the end-to-end pipelines, ionospheric conditions, and and the foreground emissions. Sufficient data has been collected to detect the theoretically predicted EoR signal. Limits have been published regularly, however we still several orders of magnitude from a possible detection. This paper outlines recent progress and indicates directions for future efforts.
Improving the Epoch of Reionization Power Spectrum Results from Murchison Widefield Array Season 1 Observations
Publisher: American Astronomical Society
Date: 07-10-2019
Smooth matter and source size in microlensing simulations of gravitationally lensed quasars
Publisher: Oxford University Press (OUP)
Date: 11-11-2007
Deep multiredshift limits on Epoch of Reionization 21 cm power spectra from four seasons of Murchison Widefield Array observations
Publisher: Oxford University Press (OUP)
Date: 12-02-2020
Abstract: We compute the spherically averaged power spectrum from four seasons of data obtained for the Epoch of Reionization (EoR) project observed with the Murchison Widefield Array (MWA). We measure the EoR power spectrum over k = 0.07–3.0 h Mpc−1 at redshifts $z$ = 6.5–8.7. The largest aggregation of 110 h on EoR0 high band (3340 observations), yields a lowest measurement of (43 mK)2 = 1.8 × 103 mK2 at k = 0.14 h Mpc−1 and $z$ = 6.5 (2σ thermal noise plus s le variance). Using the Real-Time System to calibrate and the CHIPS pipeline to estimate power spectra, we select the best observations from the central five pointings within the 2013–2016 observing seasons, observing three independent fields and in two frequency bands. This yields 13 591 2-min snapshots (453 h), based on a quality assurance metric that measures ionospheric activity. We perform another cut to remove poorly calibrated data, based on power in the foreground-dominated and EoR-dominated regions of the two-dimensional power spectrum, reducing the set to 12 569 observations (419 h). These data are processed in groups of 20 observations, to retain the capacity to identify poor data, and used to analyse the evolution and structure of the data over field, frequency, and data quality. We subsequently choose the cleanest 8935 observations (298 h of data) to form integrated power spectra over the different fields, pointings, and redshift ranges.
Comparing Redundant and Sky-model-based Interferometric Calibration: A First Look with Phase II of the MWA
Publisher: American Astronomical Society
Date: 22-08-2018
The accretion disc in the quasar SDSS J0924+0219
Publisher: Oxford University Press (OUP)
Date: 09-2009
HIPASS High-Velocity Clouds: Properties of the Compact and Extended Populations
Publisher: American Astronomical Society
Date: 02-2002
DOI: 10.1086/338088
Measuring the global 21-cm signal with the MWA-I: improved measurements of the Galactic synchrotron background using lunar occultation
Publisher: Oxford University Press (OUP)
Date: 06-09-2018
Tidal disruption of the Magellanic Clouds by the Milky Way
Publisher: Springer Science and Business Media LLC
Date: 08-1998
DOI: 10.1038/29466
Erratum: The column density distribution function at z = 0 from H I selected galaxies
Publisher: Oxford University Press (OUP)
Date: 02-2005
Intergalactic H II regions discovered in SINGG
Publisher: American Astronomical Society
Date: 03-2004
DOI: 10.1086/381905
Quasar lensing by galaxies? [10]
Publisher: Springer Science and Business Media LLC
Date: 05-1989
DOI: 10.1038/339106C0
Using Gamma-Ray Bursts to Detect a Cosmological Density of Compact Objects
Publisher: American Astronomical Society
Date: 06-1992
DOI: 10.1086/186399
The fastest-growing black hole in the Universe
Publisher: Research Square Platform LLC
Date: 30-06-2023
DOI: 10.21203/RS.3.RS-2834908/V1
Abstract: Quasars are supermassive black holes feasting on surrounding matter, which make them outshine their host galaxies. Around a million quasars have been cat- alogued in the Universe by probing deeper and using new methods for discovery. In this work, we study the properties of the most luminous of all quasars found so far. It has been overlooked until recently, which demonstrates that modern all-sky surveys have much to reveal. The black hole in this quasar accretes around one solar mass per day onto an existing mass of 15 billion solar masses. In this process its accretion disc alone releases a radiative energy that is equivalent to the output from between 365 and 640 trillion Suns. The range is mostly due to the unknown viewing angle of the disc, which radiates more intensely near its polar sight lines than at grazing angles to the disc.
X-ray properties of the Parkes sample of flat-spectrum radio sources: Dust in radio-loud quasars?
Publisher: Oxford University Press (OUP)
Date: 11-1998
The clustering of colour-selected galaxies
Publisher: Oxford University Press (OUP)
Date: 10-2000
Assessment of Ionospheric Activity Tolerances for Epoch of Reionization Science with the Murchison Widefield Array
Publisher: American Astronomical Society
Date: 25-10-2018
Gravitational Lensing:. Cosmological Measures
Publisher: WORLD SCIENTIFIC
Date: 06-2005
The distribution of microlensed light-curve derivatives: The relationship between stellar proper motions and transverse velocity
Publisher: Oxford University Press (OUP)
Date: 03-2000
Spectral Energy Distribution and Radio Halo of NGC 253 at Low Radio Frequencies
Publisher: American Astronomical Society
Date: 27-03-2017
Near-infrared properties of NOIRCAT
Publisher: Springer Netherlands
Date: 2008
Tully-Fisher relations from an H i-selected sample
Publisher: Oxford University Press (OUP)
Date: 21-12-2008
A very radio loud narrow-line Seyfert 1: PKS 2004-447
Publisher: American Astronomical Society
Date: 10-09-2001
DOI: 10.1086/322299
The radio spectral energy distribution of infrared-faint radio sources
Publisher: EDP Sciences
Date: 09-2016
A MICROLENSING MEASUREMENT OF DARK MATTER FRACTIONS IN THREE LENSING GALAXIES
Publisher: American Astronomical Society
Date: 24-03-2011
Detectability of the 21-cm signal during the epoch of reionization with 21-cm Lyman α emitter cross-correlation – I
Publisher: Oxford University Press (OUP)
Date: 11-07-2018
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University Of Cambridge
Location: United Kingdom of Great Britain and Northern Ireland
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Location: United Kingdom of Great Britain and Northern Ireland
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