ORCID Profile
0000-0002-3532-9928
Current Organisations
CSIRO
,
CSIRO Astronomy and Space Science
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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 | Instruments And Techniques | Cosmic Ray Physics | High Energy Astrophysics; Cosmic Rays | Optics And Opto-Electronic Physics | Particle Physics | Macromolecular and Materials Chemistry | Antenna Technology | Chemical Sciences Not Elsewhere Classified | Digital Systems | Earth Sciences Not Elsewhere Classified | Image Processing | Communications Technologies | Theoretical Physics | Physical Sciences Not Elsewhere Classified | Astronomical and Space Instrumentation
ANZSRC Socio-Economic Objective (SEO)
Physical sciences | Scientific instrumentation | Expanding Knowledge in the Physical Sciences | Solar-photoelectric | Computer Hardware and Electronic Equipment not elsewhere classified | Higher education | Chemical sciences | Integrated circuits and devices |
Related Links
Publications
Tracing black hole mergers through radio lobe morphology.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 23-08-2002
Abstract: Binary supermassive black holes are produced by galactic mergers as the black holes from the two galaxies fall to the center of the merged system and form a bound pair. The two black holes will eventually coalesce in an enormous burst of gravitational radiation. Here we show that the orientation of a black hole's spin axis would change dramatically even in a minor merger, leading to a sudden flip in the direction of any associated jet. We identify the winged or X-type radio sources with galaxies in which this has occurred. The inferred coalescence rate is similar to the overall galaxy merger rate, implying that of the order of one merger event per year could be detected by gravitational wave interferometers.
ALMA Band 3 polarimetric follow-up of a complete sample of faint PACO sources
Publisher: Oxford University Press (OUP)
Date: 17-07-2019
Abstract: We present Atacama Large Millimetre/submillimiter Array (ALMA) high sensitivity ($\\sigma _\\mathrm{ P} \\simeq 0.4\\,$ mJy) polarimetric observations at $97.5\\,$ GHz (Band 3) of a complete s le of 32 extragalactic radio sources drawn from the faint Planck–ATCA Co-eval Observations (PACO) s le (b & −75°, compact sources brighter than $200\\,$ mJy at $20\\,$ GHz). We achieved a detection rate of $~97\\, {\\rm per\\, cent}$ at $3\\, \\sigma$ (only 1 non-detection). We complement these observations with new Australia Telescope Compact Array (ATCA) data between 2.1 and $35\\,$GHz obtained within a few months and with data published in earlier papers from our collaboration. Adding the co-eval GaLactic and Extragalactic All-sky Murchison widefield array (GLEAM) survey detections between $70\\,$ and $230\\,$ MHz for our sources, we present spectra over more than 3 decades in frequency in total intensity and over about 1.7 decades in polarization. The spectra of our sources are smooth over the whole frequency range, with no sign of dust emission from the host galaxy at mm wavelengths or of a sharp high frequency decline due, for ex le, to electron ageing. We do however find indications of multiple emitting components and present a classification based on the number of detected components. We analyse the polarization fraction behaviour and distributions up to $97\\,$ GHz for different source classes. Source counts in polarization are presented at $95\\,$ GHz.
On the size of the galactic center compact radio source : diameter <20 AU
Publisher: Springer Science and Business Media LLC
Date: 05-1985
DOI: 10.1038/315124A0
Observability of the virialization phase of spheroidal galaxies with radio arrays
Publisher: Oxford University Press (OUP)
Date: 18-01-2008
The very low-brightness relic radio galaxy 1401-33
Publisher: Oxford University Press (OUP)
Date: 06-1987
A complete sample of radio galaxies - I. The radio data.
Publisher: Oxford University Press (OUP)
Date: 02-1989
H [CSC]i[/CSC]–bright Galaxies in the Southern Zone of Avoidance
Publisher: American Astronomical Society
Date: 06-2000
DOI: 10.1086/301374
Radio and optical studies of 4C11.50
Publisher: Oxford University Press (OUP)
Date: 07-1974
Search for ghost images: a statistical test
Publisher: Springer Science and Business Media LLC
Date: 11-1969
DOI: 10.1038/224484A0
The Parkes-MIT-NRAO southern sky survey at 4850 MHz
Publisher: Cambridge University Press (CUP)
Date: 1991
DOI: 10.1017/S1323358000023973
Abstract: During 1990 we surveyed the southern sky using a multi-beam receiver at frequencies of 4850 and 843 MHz. The half-power beamwidths were 4 and 25 arcmin respectively. The finished surveys cover the declination range between +10 and −90 degrees declination, essentially complete in right ascension, an area of 7.30 steradians. Preliminary analysis of the 4850 MHz data indicates that we will achieve a five sigma flux density limit of about 30 mJy. We estimate that we will find between 80 000 and 90 000 new sources above this limit. This is a revised version of the paper presented at the Regional Meeting by the first four authors the surveys now have been completed.
Australia Telescope Compact Array Radio Continuum 1384 and 2368 MHz Observations of Sagittarius B
Publisher: American Astronomical Society
Date: 04-02-2011
G25.5+0.2: a new luminous blue variable in the Galaxy?
Publisher: Oxford University Press (OUP)
Date: 15-08-0018
Dressing a Naked Quasar: Star Formation and Active Galactic Nucleus Feedback in HE 0450−2958
Publisher: American Astronomical Society
Date: 20-06-2007
DOI: 10.1086/518027
PERIODIC STRUCTURE IN THE MEGAPARSEC-SCALE JET OF PKS 0637–752
Publisher: American Astronomical Society
Date: 27-09-2012
High-frequency radio properties of sources in the Fermi-LAT 1 year Point Source Catalog
Publisher: American Astronomical Society
Date: 02-07-2010
A Search for the Host Galaxy of FRB 171020
Publisher: American Astronomical Society
Date: 29-10-2018
The H I Parkes All Sky Survey: southern observations, calibration and robust imaging
Publisher: Oxford University Press (OUP)
Date: 11-04-2001
CO(1–0) survey of high-z radio galaxies: alignment of molecular halo gas with distant radio sources★
Publisher: Oxford University Press (OUP)
Date: 14-01-2014
RADIO BURSTS WITH EXTRAGALACTIC SPECTRAL CHARACTERISTICS SHOW TERRESTRIAL ORIGINS
Publisher: American Astronomical Society
Date: 28-12-2010
Non-thermal radio astronomy
Publisher: Elsevier BV
Date: 2014
Radio jet interactions in the radio galaxy PKS 2152—699
Publisher: Oxford University Press (OUP)
Date: 05-1998
Molecular CO(1-0) gas in the z~2 radio galaxy MRC 0152-209
Publisher: American Astronomical Society
Date: 23-05-2011
A measurement of source noise at low frequency: Implications for modern interferometers
Publisher: Cambridge University Press (CUP)
Date: 2021
DOI: 10.1017/PASA.2021.3
Abstract: We report on the detection of source noise in the time domain at 162 MHz with the Murchison Widefield Array. During the observation, the flux of our target source Virgo A (M87) contributes only $\\sim$ 1% to the total power detected by any single antenna thus, this source noise detection is made in an intermediate regime, where the source flux detected by the entire array is comparable with the noise from a single antenna. The magnitude of source noise detected is precisely in line with predictions. We consider the implications of source noise in this moderately strong regime on observations with current and future instruments.
A lunar radio experiment with the Parkes radio telescope for the LUNASKA project
Publisher: Elsevier BV
Date: 05-2015
Radio studies of the galactic center: 1. The Sagittarius A Complex
Publisher: American Astronomical Society
Date: 07-1989
DOI: 10.1086/167635
Thermal and non-thermal components of the interstellar medium at sub-kiloparsec scales in galaxies
Publisher: EDP Sciences
Date: 09-2006
Limit on ultrahigh energy neutrino flux from the Parkes Lunar Radio Cherenkov experiment
Publisher: Oxford University Press (OUP)
Date: 11-08-2007
Interplanetary scintillation studies with the Murchison Widefield Array – II. Properties of sub-arcsecond compact sources at low radio frequencies
Publisher: Oxford University Press (OUP)
Date: 06-11-2017
Optical properties of high-frequency radio sources from the Australia Telescope 20 GHz (AT20G) Survey
Publisher: Oxford University Press (OUP)
Date: 10-10-2011
BROADBAND SPECTRAL MODELING OF THE EXTREME GIGAHERTZ-PEAKED SPECTRUM RADIO SOURCE PKS B0008-421
Publisher: American Astronomical Society
Date: 20-08-2015
New structures near the compact radio source at the Galactic centre
Publisher: Springer Science and Business Media LLC
Date: 11-1990
DOI: 10.1038/348045A0
The HIPASS catalogue - III. Optical counterparts and isolated dark galaxies
Publisher: Oxford University Press (OUP)
Date: 07-2005
No Low-frequency Emission from Extremely Bright Fast Radio Bursts
Publisher: American Astronomical Society
Date: 29-10-2018
A luminous fast radio burst that probes the Universe at redshift 1
Publisher: American Association for the Advancement of Science (AAAS)
Date: 20-10-2023
The 21-cm absorption line in NGC1275
Publisher: Springer Science and Business Media LLC
Date: 07-1976
DOI: 10.1038/262369A0
A search for distant radio galaxies from SUMSS and NVSS - III. Radio spectral energy distributions and the z-α correlation
Publisher: Oxford University Press (OUP)
Date: 11-09-2006
The radio counterpart of the Great Annihilator (1E 1740.7 - 2942)
Publisher: Oxford University Press (OUP)
Date: 05-1992
Radio frequency interference mitigation strategies: summary of the E&F White Conference held in Sydney, Australia, December 1999.
Publisher: Cambridge University Press (CUP)
Date: 2000
DOI: 10.1071/AS00035
Abstract: The E. & F. White Conference held in Sydney in December 1999 brought together expertise on a range of interference mitigation techniques from CSIRO, Australian and international industry and universities. Key goals were to enhance the understanding of techniques and their inter-relationship, to increase awareness of advanced technologies such as software radios and photonics, and to foster a cooperative approach to the development of interference mitigation techniques. The foremost application in mind was the square kilometre array (SKA) and the need to find ways to develop a hierarchical scheme for removing unwanted signals from astronomical data. This paper gives an overview of the topics discussed at the conference and summarises some of the key ideas and results that were presented.
NGC326 : a radio galaxy with a precessing beam?
Publisher: Springer Science and Business Media LLC
Date: 12-1978
DOI: 10.1038/276588A0
Comparison of the Parkes and FAST FRB DM distribution
Publisher: Oxford University Press (OUP)
Date: 11-03-2022
Abstract: We model the fast radio burst (FRB) dispersion measure (DM) distribution for the Five-hundred-meter Aperture Spherical Telescope (FAST) and compare this with the four FRBs published in the literature to date. We compare the DM distribution of Parkes and FAST, taking advantage of the similarity between their multibeam receivers. Notwithstanding the limited s le size, we observe a paucity of events at low DM for all evolutionary models considered, resulting in a sharp rise in the observed cumulative distribution function in the region of 1000 pc cm−3 ≲ DM ≲ 2000 pc cm−3. These traits could be due to statistical fluctuations (0.12 ≤ p ≤ 0.22), a complicated energy distribution or break in an energy distribution power law, spatial clustering, observational bias, or outliers in the s le (e.g. an excessive DMHost as recently found for FRB 20190520B). The energy distribution in this regime is unlikely to be adequately constrained until further events are detected. Modelling suggests that FAST may be well placed to discriminate between redshift evolutionary models and to probe the helium ionization signal of the intergalactic medium.
Deep 20-GHz survey of the Chandra deep field south and SDSS stripe 82: Source catalogue and spectral properties
Publisher: Oxford University Press (OUP)
Date: 11-02-2014
First Constraints on Compact Dark Matter from Fast Radio Burst Microstructure
Publisher: American Astronomical Society
Date: 08-09-2020
The extended radio emission in the luminous X-ray cluster A3667
Publisher: Oxford University Press (OUP)
Date: 10-1997
Wide-field imaging and polarimetry for the biggest and brightest in the 20-GHz southern sky
Publisher: Oxford University Press (OUP)
Date: 05-2009
“RadioAstron”-A telescope with a size of 300 000 km: Main parameters and first observational results
Publisher: Pleiades Publishing Ltd
Date: 03-2013
A search for long-time-scale, low-frequency radio transients
Publisher: Oxford University Press (OUP)
Date: 30-11-2016
G25.5 + 0.2: a very young galactic supernova remnant
Publisher: Oxford University Press (OUP)
Date: 12-1989
FRB event rate counts – II. Fluence, redshift, and dispersion measure distributions
Publisher: Oxford University Press (OUP)
Date: 02-08-2018
Limit on the ultrahigh-energy neutrino flux from lunar observations with the Parkes radio telescope
Publisher: American Physical Society (APS)
Date: 09-03-2015
PKS 0400-181 : a classical radio double from spiral galaxy ?
Publisher: Oxford University Press (OUP)
Date: 12-1983
LUNASKA experiments using the Australia Telescope Compact Array to search for ultrahigh energy neutrinos and develop technology for the lunar Cherenkov technique
Publisher: American Physical Society (APS)
Date: 26-02-2010
LUNASKA experiment observational limits on UHE neutrinos from Centaurus A and the Galactic Centre
Publisher: Oxford University Press (OUP)
Date: 24-09-2010
An Australia Telescope survey for CMB anisotropies
Publisher: Oxford University Press (OUP)
Date: 11-07-2000
Cosmological halos: a search for the ionized intergalactic medium.
Publisher: American Astronomical Society
Date: 10-08-2000
DOI: 10.1086/309199
A single fast radio burst localized to a massive galaxy at cosmological distance.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 09-08-2019
Abstract: Fast radio bursts (FRBs) are brief radio emissions from distant astronomical sources. Some are known to repeat, but most are single bursts. Nonrepeating FRB observations have had insufficient positional accuracy to localize them to an in idual host galaxy. We report the interferometric localization of the single-pulse FRB 180924 to a position 4 kiloparsecs from the center of a luminous galaxy at redshift 0.3214. The burst has not been observed to repeat. The properties of the burst and its host are markedly different from those of the only other accurately localized FRB source. The integrated electron column density along the line of sight closely matches models of the intergalactic medium, indicating that some FRBs are clean probes of the baryonic component of the cosmic web.
Science at Very High Angular Resolution with the Square Kilometre Array
Publisher: Cambridge University Press (CUP)
Date: 2012
DOI: 10.1071/AS11050
Abstract: Preliminary specifications for the Square Kilometre Array (SKA) call for 25% of the total collecting area of the dish array to be located at distances greater than 180 km from the core, with a maximum baseline of at least 3000 km. The array will provide angular resolution θ ≲ 40–2 mas at 0.5–10 GHz with image sensitivity reaching ≲50 nJy beam −1 in an 8-hour integration with 500-MHz bandwidth. Given these specifications, the high-angular-resolution component of the SKA will be capable of detecting brightness temperatures ≲200K with milliarcsecond-scale angular resolution. The aim of this article is to bring together in one place a discussion of the broad range of new and important high-angular-resolution science that will be enabled by the SKA, and in doing so, address the merits of long baselines as part of the SKA. We highlight the fact that high angular resolution requiring baselines greater than 1000 km provides a rich science case with projects from many areas of astrophysics, including important contributions to key SKA science.
The Parkes-MIT-NRAO (PMN) surveys. Part 2: Source catalogue for the southern survey (-87.5° < d < -37°)
Publisher: American Astronomical Society
Date: 03-1994
DOI: 10.1086/191939
Lunar radio Cherenkov observations of UHE neutrinos
Publisher: Elsevier BV
Date: 06-2009
Is the observed high-frequency radio luminosity distribution of QSOs bimodal?
Publisher: American Astronomical Society
Date: 28-06-2012
The Cosmic Ray Distribution in Sagittarius B
Publisher: American Astronomical Society
Date: 10-09-2007
DOI: 10.1086/518243
The ATESP 5 GHz radio survey
Publisher: EDP Sciences
Date: 02-2010
B0924+30 : An unusual radio galaxy
Publisher: Springer Science and Business Media LLC
Date: 12-1975
DOI: 10.1038/258584A0
The Spectral Properties of the Bright Fast Radio Burst Population
Publisher: American Astronomical Society
Date: 14-02-2019
Interplanetary scintillation studies with the Murchison Widefield Array III: comparison of source counts and densities for radio sources and their sub-arcsecond components at 162 MHz
Publisher: Oxford University Press (OUP)
Date: 23-06-2018
Discovery of H I gas in a young radio galaxy at z = 0.44 using the Australian Square Kilometre Array Pathfinder
Publisher: Oxford University Press (OUP)
Date: 24-08-2015
High radio frequency sample of bright planetary nebulae in the Southern hemisphere detected in the AT20G survey
Publisher: Oxford University Press (OUP)
Date: 19-06-2015
Spectropolarimetric Analysis of FRB 181112 at Microsecond Resolution: Implications for Fast Radio Burst Emission Mechanism
Publisher: American Astronomical Society
Date: 12-03-2020
The molecular connection to the FIR-radio continuum correlation in galaxies
Publisher: EDP Sciences
Date: 21-06-2005
HI absorption in radio elliptical galaxies - evidence for infall
Publisher: American Astronomical Society
Date: 03-1989
DOI: 10.1086/115016
The fast radio burst dispersion measure distribution
Publisher: Oxford University Press (OUP)
Date: 30-12-2020
Abstract: We compare the dispersion measure (DM) statistics of FRBs detected by the ASKAP and Parkes radio telescopes. We jointly model their DM distributions, exploiting the fact that the telescopes have different survey fluence limits but likely s le the same underlying population. After accounting for the effects of instrumental temporal and spectral resolution of each s le, we find that a fit between the modelled and observed DM distribution, using identical population parameters, provides a good fit to both distributions. Assuming a one-to-one mapping between DM and redshift for an homogeneous intergalactic medium (IGM), we determine the best-fitting parameters of the population spectral index, $\\hat{\\alpha }$, and the power-law index of the burst energy distribution, $\\hat{\\gamma }$, for different redshift evolutionary models. Whilst the overall best-fitting model yields $\\hat{\\alpha }=2.2_{-1.0}^{+0.7}$ and $\\hat{\\gamma }=2.0_{-0.1}^{+0.3}$, for a strong redshift evolutionary model, when we admit the further constraint of α = 1.5 we favour the best fit $\\hat{\\gamma }=1.5 \\pm 0.2$ and the case of no redshift evolution. Moreover, we find no evidence that the FRB population evolves faster than linearly with respect to the star formation rate over the DM (redshift) range for the s led population.
Resolving Moving Heliospheric Structures Using Interplanetary Scintillation Observations With the Murchison Widefield Array
Publisher: American Geophysical Union (AGU)
Date: 10-2023
DOI: 10.1029/2023SW003570
ON THE RELIABILITY OF POLARIZATION ESTIMATION USING ROTATION MEASURE SYNTHESIS
Publisher: American Astronomical Society
Date: 25-04-2012
John Paul Wild AC CBE FAA FTSE. 17 May 1923 — 10 May 2008
Publisher: The Royal Society
Date: 2012
Abstract: Paul Wild stands tall among the founding fathers of modern radio astronomy. His early work became the foundation for all future research on solar radio bursts. He established the theory and identified the different types of radio bursts. He developed new types of instrument, including the dynamic spectrograph and a radioheliograph to make two-dimensional movie images. His early interest in the radio spectrum of hydrogen led to an analysis of the hyperfine structure of hydrogen emission and a publication that became a classic paper in the field. Recognition that the 21 cm hydrogen line could be used to measure the Zeeman effect, and through that magnetic fields in astronomical sources, was another key contribution to modern astronomy. He became Chief of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) Division of Radiophysics and developed and demonstrated an outstanding microwave landing system for aviation. As Chairman of CSIRO he led the organization through a major restructuring and adapted CSIRO to bring it closer to industry while maintaining a high standard of excellence and originality. Throughout his career, Paul Wild provided great leadership at all levels of science in Australia.
ATLBS: the Australia Telescope Low-Brightness Survey
Publisher: Oxford University Press (OUP)
Date: 03-2010
CO observations of high-z radio galaxies MRC 2104−242 and MRC 0943−242: spectral-line performance of the Compact Array Broadband Backend
Publisher: Oxford University Press (OUP)
Date: 16-05-2011
Interplanetary Scintillation with the Murchison Widefield Array I: a sub-arcsecond survey over 900 deg2 at 79 and 158 MHz
Publisher: Oxford University Press (OUP)
Date: 07-09-2017
Extragalactic Peaked-spectrum Radio Sources at Low Frequencies
Publisher: American Astronomical Society
Date: 17-02-2017
Status report and future prospects on LUNASKA lunar observations with ATCA
Publisher: Elsevier BV
Date: 06-2009
The Host Galaxies and Progenitors of Fast Radio Bursts Localized with the Australian Square Kilometre Array Pathfinder
Publisher: American Astronomical Society
Date: 06-2020
Radio emission from the 2006-56 region
Publisher: Oxford University Press (OUP)
Date: 1982
A filamentary radio source near the Galactic Centre
Publisher: Springer Science and Business Media LLC
Date: 09-1991
DOI: 10.1038/353237A0
CO (1-0) and CO (5-4) observations of the most distant known radio galaxy at z = 5.2
Publisher: American Astronomical Society
Date: 09-02-2005
DOI: 10.1086/429147
A CO-rich merger shaping a powerful and hyperluminous infrared radio galaxy at z = 2: The Dragonfly Galaxy
Publisher: Oxford University Press (OUP)
Date: 03-06-2015
DOI: 10.1093/MNRAS/STV930
A census of compact sources at 162 MHz: First data release from the MWA Phase II IPS Survey
Publisher: Cambridge University Press (CUP)
Date: 2022
DOI: 10.1017/PASA.2022.56
Abstract: We present a catalogue of over 7000 sources from the GLEAM survey which have significant structure on sub-arcsecond scales at 162 MHz. The compact nature of these sources was detected and quantified via their Interplanetary Scintillation (IPS) signature, measured in interferometric images from the Murchison Widefield Array. The advantage of this approach is that all sufficiently compact sources across the survey area are included down to a well-defined flux density limit. The survey is based on ${\\sim}250\\times 10\\hbox{-}\\mathrm{min}$ observations, and the area covered is somewhat irregular, but the area within $1\\,\\mathrm{h} \\mathrm{RA} \\,\\mathrm{h}$ $-10^\\circ \\mathrm{Decl.} +20^\\circ$ is covered entirely, and over 85% of this area has a detection limit for compact structure below 0.2 Jy. 7839 sources clearly showing IPS were detected ( ${ }5\\sigma$ confidence), with a further 5550 tentative ( ${ }2\\sigma$ confidence) detections. Normalised Scintillation Indices (NSI a measure of the fraction of flux density coming from a compact component) are reported for these sources. Robust and informative upper limits on the NSI are reported for a further 31081 sources. This represents the largest survey of compact sources at radio frequencies ever undertaken.
A search for arcmin-scale anisotropy in the cosmic microwave background
Publisher: Oxford University Press (OUP)
Date: 07-1993
High angular resolution observation of the Sunyaev-Zel'dovich effect in the massive z ≈ 0.83 cluster Cl J0152-1357
Publisher: American Astronomical Society
Date: 30-06-2010
The radio and optical properties of the BL Lac object PKS 0521-36.
Publisher: Oxford University Press (OUP)
Date: 09-1979
MURCHISON WIDEFIELD ARRAY OBSERVATIONS OF ANOMALOUS VARIABILITY: A SERENDIPITOUS NIGHT-TIME DETECTION OF INTERPLANETARY SCINTILLATION
Publisher: American Astronomical Society
Date: 07-08-2015
Radio structure and optical kinematics of the cD Galaxy Hydra A (3C218)
Publisher: American Astronomical Society
Date: 02-1983
DOI: 10.1086/160655
Spectral-Line Observations Using a Phased Array Feed on the Parkes Telescope
Publisher: Cambridge University Press (CUP)
Date: 2017
DOI: 10.1017/PASA.2017.45
Abstract: We present first results from pilot observations using a phased array feed (PAF) mounted on the Parkes 64-m radio telescope. The observations presented here cover a frequency range from 1 150 to 1 480 MHz and are used to show the ability of PAFs to suppress standing wave problems by a factor of ~10, which afflict normal feeds. We also compare our results with previous HIPASS observations and with previous H i images of the Large Magellanic Cloud. Drift scan observations of the GAMA G23 field resulted in direct H i detections at z = 0.0043 and z = 0.0055 of HIPASS galaxies J2242-30 and J2309-30. Our new measurements generally agree with archival data in spectral shape and flux density, with small differences being due to differing beam patterns. We also detect signal in the stacked H i data of 1 094 in idually undetected galaxies in the GAMA G23 field in the redshift range 0.05 ⩽ z ⩽ 0.075. Finally, we use the low standing wave ripple and wide bandwidth of the PAF to set a 3σ upper limit to any positronium recombination line emission from the Galactic Centre of .09 K, corresponding to a recombination rate of .0 × 10 45 s −1 .
The jet/wind outflow in Centaurus A: A local laboratory for AGN feedback
Publisher: Oxford University Press (OUP)
Date: 09-11-2018
The local radio-galaxy population at 20 GHz
Publisher: Oxford University Press (OUP)
Date: 12-2014
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
WISE mid-infrared properties of compact active galactic nuclei selected from the high radio frequency AT20G survey
Publisher: Oxford University Press (OUP)
Date: 24-02-2020
Abstract: Past studies of compact active galactic nuclei (AGNs), the dominant population at high radio frequencies, selected them using flat spectral index criteria. This biases the s le due to the steepening of AGN spectra at high radio frequencies. We improve upon this by selecting 3610 compact AGNs using their angular size information ($\\lesssim$0.15 arcsec scale) from the Australia Telescope 20 GHz (AT20G) high-angular resolution catalogue. We cross-match these against the Wide-field Infrared Survey Explorer AllWISE catalogue and present a catalogue with 3300 (91 per cent) matches, 91 (3 per cent) rejects, and 219 (6 per cent) non-detections that are excellent high-redshift candidates. Of the matched compact AGNs, 92 per cent exhibit QSO mid-infrared colours (W1−W2 & 0.5). Therefore, our s le of high frequency compact sources has a very high rate of identification with mid-infrared QSOs. We find counterparts for 88 per cent of 387 compact steep-spectrum (CSS) sources in the AT20G survey, 82 ± 5 per cent of which exhibit QSO mid-infrared colours and have moderate redshifts (zmedian = 0.82), while those dominated by host galaxy colours in mid-infrared have lower redshifts (zmedian = 0.13). The latter classified into late- and early-type galaxies using their mid-infrared colours shows a majority (68 ± 4 per cent) have colours characteristic of late-type galaxies. Thus, we find that a larger fraction of these CSS sources are embedded in hosts with higher gas densities than average early-type galaxies. We compare mid-infrared colours of our AGNs against those reported for AGNs primarily selected using non-radio techniques. This shows that mid-infrared SED of high frequency selected compact radio AGN is comparatively less red, possibly due to contributions from their hosts.
HIPASS Detection of an Intergalactic Gas Cloud in the NGC 2442 Group
Publisher: American Astronomical Society
Date: 07-2001
DOI: 10.1086/321453
Detection of the Pulsed Radio Source CP 1919 at 13 cm Wavelength
Publisher: Springer Science and Business Media LLC
Date: 04-1968
DOI: 10.1038/218227A0
The ATESP radio survey
Publisher: EDP Sciences
Date: 2001
A VLA search for young galactic supernova remnants
Publisher: American Astronomical Society
Date: 08-1992
DOI: 10.1086/116266
The radio galaxy IC 4296 (PKS 1333-33). I. Multifrequency very large array observations
Publisher: American Astronomical Society
Date: 03-1986
DOI: 10.1086/163992
The Detection of an Extremely Bright Fast Radio Burst in a Phased Array Feed Survey
Publisher: American Astronomical Society
Date: 22-05-2017
The ATESP radio survey
Publisher: EDP Sciences
Date: 04-2001
Interpretation of radio continuum and molecular line observations of Sgr B2: free-free and synchrotron emission, and implications for cosmic rays
Publisher: Oxford University Press (OUP)
Date: 09-2008
Fast radio burst event rate counts – I. Interpreting the observations
Publisher: Oxford University Press (OUP)
Date: 11-2017
Variable radio emission from the extragalactic supernova 1970g, in M101
Publisher: Springer Science and Business Media LLC
Date: 05-1973
The dispersion–brightness relation for fast radio bursts from a wide-field survey
Publisher: Springer Science and Business Media LLC
Date: 10-2018
DOI: 10.1038/S41586-018-0588-Y
Abstract: Despite considerable efforts over the past decade, only 34 fast radio bursts-intense bursts of radio emission from beyond our Galaxy-have been reported
Centaurus A: multiple outbursts or bursting bubble?
Publisher: Oxford University Press (OUP)
Date: 08-1999
Limits on Precursor and Afterglow Radio Emission from a Fast Radio Burst in a Star-forming Galaxy
Publisher: American Astronomical Society
Date: 24-09-2020
A Transient Radio Source near the Center of the Milky Way Galaxy
Publisher: American Association for the Advancement of Science (AAAS)
Date: 20-03-1992
DOI: 10.1126/SCIENCE.255.5051.1538
Abstract: In late December 1990, a new radio source appeared near the center of our galaxy rivaling the intensity of Sgr A(*) (the compact radio source at the galactic center). Following its first detection, the flux density of the galactic center transient (GCT) increased rapidly to a maximum 1 month later, and then declined gradually with a time scale of about 3 months. Surprisingly, the GCT maintained a steep radio spectrum during both its rising and decay phases. The neutral hydrogen (HI) absorption shows similar absorption to that in front of Sgr A(*) this indicates that the GCT lies near the galactic center. Furthermore, both HI and OH observations show an additional deep absorption at +20 kilometers per second with respect to the local standard of rest. Thus, the GCT is either embedded in or located behind a molecular cloud moving with that velocity. The cloud can be seen on infrared images. Its opacity is shown to be inadequate to conceal a supernova near the galactic center. It is argued that the GCT was probably transient radio emission from synchrotron-radiating plasma associated with an x-ray binary system.
Ultra- and hyper-compact H ii regions at 20 GHz
Publisher: Oxford University Press (OUP)
Date: 04-2010
Radio emission from the unusual supernova 1998bw and its association with the $γ$-ray burst of 25 April 1998
Publisher: Springer Science and Business Media LLC
Date: 10-1998
DOI: 10.1038/27139
The exploration of the unknown
Publisher: Elsevier BV
Date: 12-2004
Thermal plasma in the giant lobes of the radio galaxy Centaurus A
Publisher: American Astronomical Society
Date: 04-02-2013
Parsecscale Radio Cores in Early Type Galaxies
Publisher: Oxford University Press (OUP)
Date: 15-08-1994
The ATESP 5 GHz radio survey
Publisher: EDP Sciences
Date: 12-09-2006
Nonthermal continuum radiation in three elliptical galaxies
Publisher: American Astronomical Society
Date: 06-1975
DOI: 10.1086/153603
High-resolution VLA images of the Galactic Centre at 2-cm wavelength with large dynamic range
Publisher: Springer Science and Business Media LLC
Date: 11-1991
DOI: 10.1038/354046A0
A polarization survey of bright extragalactic AT20G sources
Publisher: Oxford University Press (OUP)
Date: 30-10-2013
Spectral properties and the effect on redshift cut-off of compact active galactic nuclei from the AT20G survey
Publisher: Oxford University Press (OUP)
Date: 04-04-2012
Division X working group on radio frequency interference mitigation
Publisher: Cambridge University Press (CUP)
Date: 14-05-2010
DOI: 10.1017/S1743921310005260
Abstract: The IAU Working Group on Radio Frequency Interference (RFI) Mitigation was setup in the 2000 IAU GA in Manchester and its mandate was renewed at subsequent IAU GAs in 2003 and 2006. It was noted that that there are important issues related to RFI mitigation that extend beyond the regulatory function of IUCAF, and hence a more extended working group, which may include IUCAF members, was established.
The AT20G high-angular-resolution catalogue
Publisher: Oxford University Press (OUP)
Date: 07-2013
DOI: 10.1093/MNRAS/STT975
A new method to calibrate onospheric pulse dispersion for UHE cosmic ray and neutrino detection using the Lunar Cherenkov technique
Publisher: Elsevier BV
Date: 2012
Space Weather with Radio Telescopes in Australia
Publisher: Copernicus GmbH
Date: 15-05-2023
DOI: 10.5194/EGUSPHERE-EGU23-15289
Abstract: CSIRO, Australia's national science agency, operates a number of world-class radio astronomy observatories that are collectively known as the Australia Telescope National Facility (ATNF). The facility offers a powerful view of the southern hemisphere radio spectrum and supports world-leading research by Australian and international astronomers. Decades after the Culgoora Radioheliograph made fundamental discoveries about solar radio bursts, a new generation of radio telescopes in Australia are providing unique measurement capabilities to address outstanding questions in Heliophysics. Inyarrimanha Ilgari Bundara (& #8220 Sharing the Sky and Stars& #8221 ), the CSIRO Murchison Radio-astronomy Observatory in Western Australia, is home to the Murchison Widefield Array (operated by a consortium led by Curtin University), the Australian Square Kilometre Array Pathfinder (ASKAP), and the future home of the Square Kilometre Array (SKA)-Low Telescope. Interplanetary scintillation (IPS) measurements by these radio telescope arrays will provide important observational constraints of the solar wind and interplanetary coronal mass ejections (ICMEs). This is enabled by simultaneous detections of a high density of scintillating sources over a wide field of view. Complementarily, Parkes Radio Telescope observations towards pulsars may provide density and magnetic field diagnostics of the corona and solar wind. In addition, radio observations toward exoplanet host stars give important constraints on the habitability of exoplanets. In this presentation, we will introduce the facilities, relevant radio astronomical diagnostics, early results, and plans for using the observations for data assimilation.&
The 1000 brightest HIPASS galaxies: Newly cataloged galaxies
Publisher: American Astronomical Society
Date: 10-2002
DOI: 10.1086/342546
The slope of the source-count distribution for fast radio bursts
Publisher: Oxford University Press (OUP)
Date: 10-11-2018
Low-Mach-number turbulence in interstellar gas revealed by radio polarization gradients
Publisher: Springer Science and Business Media LLC
Date: 10-2011
DOI: 10.1038/NATURE10446
Abstract: The interstellar medium of the Milky Way is multiphase, magnetized and turbulent. Turbulence in the interstellar medium produces a global cascade of random gas motions, spanning scales ranging from 100 parsecs to 1,000 kilometres (ref. 4). Fundamental parameters of interstellar turbulence such as the sonic Mach number (the speed of sound) have been difficult to determine, because observations have lacked the sensitivity and resolution to image the small-scale structure associated with turbulent motion. Observations of linear polarization and Faraday rotation in radio emission from the Milky Way have identified unusual polarized structures that often have no counterparts in the total radiation intensity or at other wavelengths, and whose physical significance has been unclear. Here we report that the gradient of the Stokes vector (Q, U), where Q and U are parameters describing the polarization state of radiation, provides an image of magnetized turbulence in diffuse, ionized gas, manifested as a complex filamentary web of discontinuities in gas density and magnetic field. Through comparison with simulations, we demonstrate that turbulence in the warm, ionized medium has a relatively low sonic Mach number, M(s) ≲ 2. The development of statistical tools for the analysis of polarization gradients will allow accurate determinations of the Mach number, Reynolds number and magnetic field strength in interstellar turbulence over a wide range of conditions.
J06587-5558: a very unusual polarized radio source.
Publisher: Oxford University Press (OUP)
Date: 12-2001
High-resolution Imaging of the ATLBS Regions: The radio source counts
Publisher: American Astronomical Society
Date: 11-12-2013
The Planck-ATCA Co-eval observations project: The bright sample
Publisher: Oxford University Press (OUP)
Date: 13-06-2011
The large-scale distribution of neutral hydrogen in the Fornax region
Publisher: Oxford University Press (OUP)
Date: 09-2002
Radio studies of the galactic centre: II. The arc, threads and related features at 90 cm (330 MHz)
Publisher: Oxford University Press (OUP)
Date: 15-03-1991
Overview of lunar detection of ultra-high energy particles and new plans for the SKA
Publisher: EDP Sciences
Date: 2017
SETI and the one-square-kilometre radio telescope
Publisher: Elsevier BV
Date: 05-1997
Characterizing the Fast Radio Burst Host Galaxy Population and its Connection to Transients in the Local and Extragalactic Universe
Publisher: American Astronomical Society
Date: 17-01-2022
Abstract: We present the localization and host galaxies of one repeating and two apparently nonrepeating fast radio bursts (FRBs). FRB 20180301A was detected and localized with the Karl G. Jansky Very Large Array to a star-forming galaxy at z = 0.3304. FRB20191228A and FRB20200906A were detected and localized by the Australian Square Kilometre Array Pathfinder to host galaxies at z = 0.2430 and z = 0.3688, respectively. We combine these with 13 other well-localized FRBs in the literature, and analyze the host galaxy properties. We find no significant differences in the host properties of repeating and apparently nonrepeating FRBs. FRB hosts are moderately star forming, with masses slightly offset from the star-forming main sequence. Star formation and low-ionization nuclear emission-line region emission are major sources of ionization in FRB host galaxies, with the former dominant in repeating FRB hosts. FRB hosts do not track stellar mass and star formation as seen in field galaxies (more than 95% confidence). FRBs are rare in massive red galaxies, suggesting that progenitor formation channels are not solely dominated by delayed channels which lag star formation by gigayears. The global properties of FRB hosts are indistinguishable from core-collapse supernovae and short gamma-ray bursts hosts, and the spatial offset (from galaxy centers) of FRBs is mostly inconsistent with that of the Galactic neutron star population (95% confidence). The spatial offsets of FRBs (normalized to the galaxy effective radius) also differ from those of globular clusters in late- and early-type galaxies with 95% confidence.
Radio observations of three supernova remnants in M33
Publisher: Oxford University Press (OUP)
Date: 12-1980
A search for lunar radio Cerenkov emission form high-energy neutrinos
Publisher: Oxford University Press (OUP)
Date: 12-1996
The ATESP 5 GHz radio survey
Publisher: EDP Sciences
Date: 06-11-2007
The Northern HIPASS catalogue - Data presentation, completeness and reliability measures
Publisher: Oxford University Press (OUP)
Date: 10-2006
ATPMN: Accurate positions and flux densities at 5 and 8GHz for 8385 sources from the PMN survey
Publisher: Oxford University Press (OUP)
Date: 19-03-2012
HIPASS High-Velocity Clouds: Properties of the Compact and Extended Populations
Publisher: American Astronomical Society
Date: 02-2002
DOI: 10.1086/338088
ATLBS extended source sample: The evolution in radio source morphology with flux density
Publisher: American Astronomical Society
Date: 15-03-2012
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 .
The properties of extragalactic radio sources selected at 20 GHz
Publisher: Oxford University Press (OUP)
Date: 11-09-2006
Tidal disruption of the Magellanic Clouds by the Milky Way
Publisher: Springer Science and Business Media LLC
Date: 08-1998
DOI: 10.1038/29466
An Extragalactic H [CSC]i[/CSC] Cloud with No Optical Counterpart?
Publisher: American Astronomical Society
Date: 09-2000
DOI: 10.1086/301542
The Parkes-MIT-NRAO (PMN) surveys. VI. Source catalog for the equatorial survey (-9.5° < d< +10.0°)
Publisher: American Astronomical Society
Date: 04-1995
DOI: 10.1086/192146
The radio continuum structure of centaurus a at 1.4GHz
Publisher: American Astronomical Society
Date: 20-09-2011
Identification of extragalactic radio sources between declinations -20° and -44°
Publisher: CSIRO Publishing
Date: 1965
DOI: 10.1071/PH650627
Abstract: Identifications with extragalactic objects are suggested for 55 radio sources with declinations between _200 and _44�. The identifications are based on a search of the Palomar Sky Survey plates in the position of sources in the Parkes catalogue. Eight of the identifications are with suspected quasi-stellar objects and the remainder with galaxies. Finding charts are provided for the fainter obje~ts.
A Blind H [CSC]i[/CSC] Survey for Galaxies in the Zone of Avoidance, 308° ≤ [CLC][ITAL]l[/ITAL][/CLC] ≤ 332°
Publisher: American Astronomical Society
Date: 04-2000
DOI: 10.1086/301303
CO(1–0) detection of molecular gas in the massive Spiderweb Galaxy (z = 2)★
Publisher: Oxford University Press (OUP)
Date: 03-2013
DOI: 10.1093/MNRAS/STT147
A search for artificial signals from the Small Magellanic Cloud
Publisher: American Astronomical Society
Date: 07-1996
DOI: 10.1086/117996
Detection and Characterization of a Coronal Mass Ejection Using Interplanetary Scintillation Measurements From the Murchison Widefield Array
Publisher: American Geophysical Union (AGU)
Date: 05-2023
DOI: 10.1029/2022SW003396
Abstract: We have shown previously that the Murchison Widefield Array (MWA), can detect 100s of Interplanetary Scintillation (IPS) sources simultaneously across a field of view (FoV) ∼30° in extent. To test if we can use this capability to track heliospheric structures, we undertook a search of 88 hr of MWA IPS data, and identified an observation likely to have a significant Coronal Mass Ejection (CME) in the FoV. We demonstrate that in a single 5‐min MWA observation we are able to localize and image a CME ∼33 hr after launch at an elongation of ∼37° from the Sun. We use IPS observables to constrain the kinematics of the CME, and describe how MWA IPS observations can be used in the future to make a unique contribution to heliospheric modeling efforts.
High time resolution and polarization properties of ASKAP-localized fast radio bursts
Publisher: Oxford University Press (OUP)
Date: 24-07-2020
Abstract: Combining high time and frequency resolution full-polarization spectra of fast radio bursts (FRBs) with knowledge of their host galaxy properties provides an opportunity to study both the emission mechanism generating them and the impact of their propagation through their local environment, host galaxy, and the intergalactic medium. The Australian Square Kilometre Array Pathfinder (ASKAP) telescope has provided the first ensemble of bursts with this information. In this paper, we present the high time and spectral resolution, full polarization observations of five localized FRBs to complement the results published for the previously studied ASKAP FRB 181112. We find that every FRB is highly polarized, with polarization fractions ranging from 80 to 100 per cent, and that they are generally dominated by linear polarization. While some FRBs in our s le exhibit properties associated with an emerging archetype (i.e. repeating or apparently non-repeating), others exhibit characteristic features of both, implying the existence of a continuum of FRB properties. When examined at high time resolution, we find that all FRBs in our s le have evidence for multiple subcomponents and for scattering at a level greater than expected from the Milky Way. We find no correlation between the erse range of FRB properties (e.g. scattering time, intrinsic width, and rotation measure) and any global property of their host galaxy. The most heavily scattered bursts reside in the outskirts of their host galaxies, suggesting that the source-local environment rather than the host interstellar medium is likely the dominant origin of the scattering in our s le.
Bandpass calibration of a wideband spectrometer using coherent pulse injection
Publisher: Springer Science and Business Media LLC
Date: 13-03-2017
The very large array: Design and performance of a modern synthesis radio telescope
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 1983
The Sgr A East HII Complex at 1 = -0 02, b = -0 07
Publisher: Oxford University Press (OUP)
Date: 07-1985
Characterization of polarimetric and total intensity behaviour of a complete sample of PACO radio sources in the radio bands
Publisher: Oxford University Press (OUP)
Date: 13-12-2017
Molecular Gas at High Redshift: Jet-induced Star Formation?
Publisher: American Astronomical Society
Date: 13-08-2004
DOI: 10.1086/424843
FARADAY ROTATION STRUCTURE ON KILOPARSEC SCALES IN THE RADIO LOBES OF CENTAURUS A
Publisher: American Astronomical Society
Date: 18-11-2009
Interplanetary Scintillation with the Murchison Widefield Array V: An all-sky survey of compact sources using a modern low-frequency radio telescope
Publisher: Cambridge University Press (CUP)
Date: 2019
DOI: 10.1017/PASA.2018.40
Abstract: We describe the parameters of a low-frequency all-sky survey of compact radio sources using Interplanetary Scintillation, undertaken with the Murchison Widefield Array. While this survey gives important complementary information to low-resolution survey, providing information on the sub-arsecond structure of every source, a survey of this kind has not been attempted in the era of low-frequency imaging arrays such as the Murchison Widefield Array and LOw Frequency Array. Here we set out the capabilities of such a survey, describing the limitations imposed by the heliocentric observing geometry and by the instrument itself. We demonstrate the potential for Interplanetary Scintillation measurements at any point on the celestial sphere and we show that at 160 MHz, reasonable results can be obtained within 30° of the ecliptic (2 π str: half the sky). We also suggest some observational strategies and describe the first such survey, the Murchison Widefield Array Phase I Interplanetary Scintillation survey. Finally we analyse the potential of the recently upgraded Murchison Widefield Array and discuss the potential of the Square Kilometre Array-low to use Interplanetary Scintillation to probe sub-mJy flux density levels at sub-arcsecond angular resolution.
Further observations of pulsating radio sources at 13 cm
Publisher: Springer Science and Business Media LLC
Date: 11-1968
DOI: 10.1038/220756A0
John Paul Wild 1923 _ 2008
Publisher: CSIRO Publishing
Date: 2012
DOI: 10.1071/HR12011
Abstract: Paul Wild stands tall among the founding fathers of modern radio astronomy. His early work became the foundation for all future research on solar radio bursts. He established the theory and identified the different types of radio bursts. He developed new types of instrument including the dynamic spectrograph and a radioheliograph to make two-dimensional movie images. His early interest in the radio spectrum of hydrogen led to analysis of the hyperfine structure of hydrogen emission and a publication that became a classic paper in the field. Recognition that the 21 cm hydrogen line could be used to measure the Zeeman effect and through that magnetic fields in astronomical sources was another key contribution to modern astronomy. He became Chief of the CSIRO Division of Radiophysics and developed and demonstrated an outstanding microwave landing system for aviation. As Chairman of CSIRO he led the organization through a major restructuring and adapted CSIRO to bring it closer to industry while maintaining a high standard of excellence and originality. Throughout his career, Paul Wild provided great leadership at all levels of science in Australia.
The Planck-ATCA Coeval Observations project: The faint sample
Publisher: Oxford University Press (OUP)
Date: 07-2011
Variations of Small Quasar Components at 2,300 MHz
Publisher: Springer Science and Business Media LLC
Date: 12-1969
DOI: 10.1038/2241094B0
A multiresolution analysis of the radio-FIR correlation in the Large Magellanic Cloud
Publisher: Oxford University Press (OUP)
Date: 21-07-2006
Radio evidence for binary super massive black holes
Publisher: Cambridge University Press (CUP)
Date: 08-2016
DOI: 10.1017/S1743921315007401
Abstract: I present ex les of radio AGN with binary nuclei which provide the direct radio evidence for binary Super Massive Black Holes (SMBH) driving the AGN activity. There is also other evidence for distorted radio morphology and periodic variability which may indicate the presence of a second (inactive) SMBH. Finally I enumerate a number of possible radio tracers for the binary SMBH merger events.
The Prague IAU General Assembly, Pluto and the IAU processes
Publisher: Cambridge University Press (CUP)
Date: 12-2019
DOI: 10.1017/S1743921319000115
Abstract: At the Sydney IAU General Assembly (GA) the statutes were modified to remove the votes by in idual members. Few noticed this at the time but the subsequent reaction by disenfranchised members led us to revise this position in Prague. The need to have a members’ vote on the status of Pluto was complicated by these changes and the drama behind the scene at the Prague GA where the planet definition was resolved is not well known despite the huge public impact of this GA. I will describe some of the activities of the executive and its working groups during this very exciting GA. The IAU structures served us well during this process but of course there were also many lessons learned.
Spectral Energy Distribution and Radio Halo of NGC 253 at Low Radio Frequencies
Publisher: American Astronomical Society
Date: 27-03-2017
A pilot ASKAP survey of radio transient events in the region around the intermittent pulsar PSR J1107-5907
Publisher: Oxford University Press (OUP)
Date: 14-01-2016
BIGHORNS - Broadband Instrument for Global HydrOgen ReioNisation Signal
Publisher: Cambridge University Press (CUP)
Date: 2015
DOI: 10.1017/PASA.2015.3
Abstract: The redshifted 21cm line of neutral hydrogen ( Hi ), potentially observable at low radio frequencies (~50–200 MHz), should be a powerful probe of the physical conditions of the inter-galactic medium during Cosmic Dawn and the Epoch of Reionisation (EoR). The sky-averaged Hi signal is expected to be extremely weak (~100 mK) in comparison to the foreground of up to 10 4 K at the lowest frequencies of interest. The detection of such a weak signal requires an extremely stable, well characterised system and a good understanding of the foregrounds. Development of a nearly perfectly (~mK accuracy) calibrated total power radiometer system is essential for this type of experiment. We present the BIGHORNS (Broadband Instrument for Global HydrOgen ReioNisation Signal) experiment which was designed and built to detect the sky-averaged Hi signal from the EoR at low radio frequencies. The BIGHORNS system is a mobile total power radiometer, which can be deployed in any remote location in order to collect radio frequency interference (RFI) free data. The system was deployed in remote, radio quiet locations in Western Australia and low RFI sky data have been collected. We present a description of the system, its characteristics, details of data analysis, and calibration. We have identified multiple challenges to achieving the required measurement precision, which triggered two major improvements for the future system.
A multi-frequency study of the radio galaxy NGC 326. I. The data
Publisher: EDP Sciences
Date: 12-2001
The performance and calibration of the CRAFT fly’s eye fast radio burst survey
Publisher: Cambridge University Press (CUP)
Date: 2019
DOI: 10.1017/PASA.2019.1
Abstract: The Commensal Real-time Australian Square Kilometre Array Pathfinder Fast Transients survey is the first extensive astronomical survey using phased array feeds. Since January 2017, it has been searching for fast radio bursts in fly’s eye mode. Here, we present a calculation of the sensitivity and total exposure of the survey that detected the first 20 of these bursts, using the pulsars B1641-45 and B0833-45 as calibrators. The beamshape, antenna-dependent system noise, and the effects of radio-frequency interference and fluctuations during commissioning are quantified. Effective survey exposures and sensitivities are calculated as a function of the source counts distribution. Statistical ‘stat’ and systematics ‘sys’ effects are treated separately. The implied fast radio burst rate is significantly lower than the 37 sky −1 day −1 calculated using nominal exposures and sensitivities for this same s le by Shannon et al. (2018). At the Euclidean (best-fit) power-law index of −1.5 (−2.2), the rate is $12.7_{-2.2}^{+3.3}$ (sys) ± 3.6 (stat) sky −1 day −1 ( $20.7_{-1.7}^{+2.1}$ (sys) ± 2.8 (stat) sky −1 day −1 ) above a threshold of 56.6 ± 6.6(sys) Jy ms (40.4 ± 1.2(sys) Jy ms). This strongly suggests that these calculations be performed for other FRB-hunting experiments, allowing meaningful comparisons to be made between them.
A census of baryons in the Universe from localized fast radio bursts
Publisher: Springer Science and Business Media LLC
Date: 27-05-2020
Molecular gas in the halo fuels the growth of a massive cluster galaxy at high redshift
Publisher: American Association for the Advancement of Science (AAAS)
Date: 02-12-2016
Abstract: The massive Spiderweb galaxy is surrounded by molecular gas as it goes through its formation process.
The Parkes-MIT-NRAO (PMN) surveys. Part 3: Source catalog for the Tropical Survey (-29° < d < -9.5°)
Publisher: American Astronomical Society
Date: 1994
DOI: 10.1086/191863
Related Organisations
Commonwealth Scientific And Industrial Research Organisation
Location: Australia
ANU Research School Of Astronomy And Astrophysics
Location: Australia
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Start Date: 03-2003
End Date: 02-2008
Amount: $1,417,500.00
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End Date: 12-2005
Amount: $1,849,438.00
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View Funded ActivityDiscovery Projects - Grant ID: DP0210352
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End Date: 05-2007
Amount: $1,208,000.00
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View Funded ActivityDiscovery Projects - Grant ID: DP0881006
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View Funded ActivityDiscovery Projects - Grant ID: DP200102643
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Amount: $378,000.00
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View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE0228799
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Amount: $1,602,000.00
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View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE200100078
Start Date: 2020
End Date: 06-2023
Amount: $250,000.00
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View Funded ActivitySpecial Research Initiatives - Grant ID: SR0354861
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End Date: 10-2004
Amount: $15,000.00
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View Funded ActivityDiscovery Projects - Grant ID: DP0559991
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Amount: $600,000.00
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View Funded ActivitySpecial Research Initiatives - Grant ID: SR0354527
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End Date: 12-2004
Amount: $10,000.00
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View Funded Activity