ORCID Profile
0000-0003-2519-7375
Current Organisation
Manly Astrophysics
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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 | General Relativity and Gravitational Waves | Astronomical and Space Instrumentation | Baseband Technology | Computer Software | Stellar Astronomy and Planetary Systems | Astronomy And Astrophysics | Software Engineering | Distributed and Grid Systems | Concurrent Programming
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in the Physical Sciences | Application Software Packages (excl. Computer Games) | Command, Control and Communications | Expanding Knowledge in the Information and Computing Sciences | Physical sciences | Scientific instrumentation |
Related Links
Publications
Rotation measure variations for 20 millisecond pulsars
Publisher: Springer Science and Business Media LLC
Date: 14-06-2011
FRBCAT: The Fast Radio Burst Catalogue
Publisher: Cambridge University Press (CUP)
Date: 2016
DOI: 10.1017/PASA.2016.35
Abstract: Here, we present a catalogue of known Fast Radio Burst sources in the form of an online catalogue, FRBCAT. The catalogue includes information about the instrumentation used for the observations for each detected burst, the measured quantities from each observation, and model-dependent quantities derived from observed quantities. To aid in consistent comparisons of burst properties such as width and signal-to-noise ratios, we have re-processed all the bursts for which we have access to the raw data, with software which we make available. The originally derived properties are also listed for comparison. The catalogue is hosted online as a Mysql database which can also be downloaded in tabular or plain text format for off-line use. This database will be maintained for use by the community for studies of the Fast Radio Burst population as it grows.
RADIO DISAPPEARANCE OF THE MAGNETAR XTE J1810–197 AND CONTINUED X-RAY TIMING
Publisher: American Astronomical Society
Date: 28-03-2016
Discovery of a Steep-spectrum Low-luminosity Pulsar with the Murchison Widefield Array
Publisher: American Astronomical Society
Date: 04-2021
Abstract: We report the discovery of the first new pulsar with the Murchison Widefield Array (MWA), PSR J0036−1033, a long-period (0.9 s) nonrecycled pulsar with a dispersion measure (DM) of 23.1 pc cm −3 . It was found after processing only a small fraction (∼1%) of data from an ongoing all-sky pulsar survey. Follow-up observations have been made with the MWA, the upgraded Giant Metrewave Radio Telescope (uGMRT), and the Parkes 64 m telescopes, spanning a frequency range from ∼150 MHz to 4 GHz. The pulsar is faint, with an estimated flux density ( S ) of ∼1 mJy at 400 MHz and a spectrum , where ν is frequency. The DM-derived distance implies that it is also a low-luminosity source (∼0.1 mJy kpc 2 at 1400 MHz). The analysis of archival MWA observations reveals that the pulsar’s mean flux density varies by up to a factor of ∼5–6 on timescales of several weeks to months. By combining MWA and uGMRT data, the pulsar position was determined to arcsecond precision. We also report on polarization properties detected in the MWA and Parkes bands. The pulsar’s nondetection in previous pulsar and continuum imaging surveys, the observed high variability, and its detection in a small fraction of the survey data searched to date, all hint at a larger population of pulsars that await discovery in the southern hemisphere, with the MWA and the future low-frequency Square Kilometre Array.
Detection of fast transients with radio interferometric arrays
Publisher: American Astronomical Society
Date: 18-04-2013
Radio astronomical polarimetry and point-source calibration
Publisher: American Astronomical Society
Date: 05-2004
DOI: 10.1086/383187
Radio astronomical polarimetry and phase-coherent matrix convolution
Publisher: American Astronomical Society
Date: 20-03-2002
DOI: 10.1086/338810
On detection of the stochastic gravitational-wave background using the Parkes pulsar timing array
Publisher: Oxford University Press (OUP)
Date: 04-2011
The relativistic binary programme on MeerKAT: science objectives and first results
Publisher: Oxford University Press (OUP)
Date: 15-02-2021
Abstract: We describe the ongoing Relativistic Binary programme (RelBin), a part of the MeerTime large survey project with the MeerKAT radio telescope. RelBin is primarily focused on observations of relativistic effects in binary pulsars to enable measurements of neutron star masses and tests of theories of gravity. We selected 25 pulsars as an initial high priority list of targets based on their characteristics and observational history with other telescopes. In this paper, we provide an outline of the programme, and present polarization calibrated pulse profiles for all selected pulsars as a reference catalogue along with updated dispersion measures. We report Faraday rotation measures for 24 pulsars, twelve of which have been measured for the first time. More than a third of our selected pulsars show a flat position angle swing confirming earlier observations. We demonstrate the ability of the Rotating Vector Model, fitted here to seven binary pulsars, including the Double Pulsar (PSR J0737–3039A), to obtain information about the orbital inclination angle. We present a high time resolution light curve of the eclipse of PSR J0737–3039A by the companion’s magnetosphere, a high-phase-resolution position angle swing for PSR J1141–6545, an improved detection of the Shapiro delay of PSR J1811–2405, and pulse scattering measurements for PSRs J1227–6208, J1757–1854, and J1811–1736. Finally, we demonstrate that timing observations with MeerKAT improve on existing data sets by a factor of, typically, 2–3, sometimes by an order of magnitude.
An all-sky search for continuous gravitational waves in the Parkes Pulsar Timing Array data set
Publisher: Oxford University Press (OUP)
Date: 17-09-2014
A MeerKAT look at the polarization of 47 Tucanae pulsars: magnetic field implications
Publisher: Oxford University Press (OUP)
Date: 11-11-2022
Abstract: We present the polarization profiles of 22 pulsars in the globular cluster 47 Tucanae using observations from the MeerKAT radio telescope at UHF band (544–1088 MHz) and report precise values of dispersion measure (DM) and rotation measure (RM). We use these measurements to investigate the presence of turbulence in electron density and magnetic fields. The structure function of DM shows a break at ∼30 arcsec (∼0.6 pc at the distance of 47 Tucanae) that suggests the presence of turbulence in the gas in the cluster driven by the motion of wind-shedding stars. On the other hand, the structure function of RM does not show evidence of a break. This non-detection could be explained either by the limited number of pulsars or by the effects of the intervening gas in the Galaxy along the line of sight. Future pulsar discoveries in the cluster could help confirm the presence and localize the turbulence.
The SUrvey for Pulsars and Extragalactic Radio Bursts – IV. Discovery and polarimetry of a 12.1-s radio pulsar
Publisher: Oxford University Press (OUP)
Date: 05-02-2020
Abstract: We report the discovery of PSR J2251−3711, a radio pulsar with a spin period of 12.1 s, the second longest currently known. Its timing parameters imply a characteristic age of 15 Myr, a surface magnetic field of 1.3 × 1013 G, and a spin-down luminosity of 2.9 × 1029 erg s−1. Its dispersion measure of 12.12(1) pc cm−3 leads to distance estimates of 0.5 and 1.3 kpc according to the NE2001 and YMW16 Galactic free electron density models, respectively. Some of its single pulses show an uninterrupted 180-deg sweep of the phase-resolved polarization position angle, with an S-shape reminiscent of the rotating vector model prediction. However, the fact that this sweep occurs at different phases from one pulse to another is remarkable and without straightforward explanation. Although PSR J2251−3711 lies in the region of the $P-\\dot{P}$ parameter space occupied by the X-ray isolated neutron stars (XINS), there is no evidence for an X-ray counterpart in our Swift XRT observation this places a 99 per cent-confidence upper bound on its unabsorbed bolometric thermal luminosity of $1.1 \\times 10^{31}~(d / 1~\\mathrm{kpc})^2~\\mathrm{erg\\, s}^{-1}$ for an assumed temperature of 85 eV, where d is the distance to the pulsar. Further observations are needed to determine whether it is a rotation-powered pulsar with a true age of at least several Myr, or a much younger object such as an XINS or a recently cooled magnetar. Extreme specimens like PSR J2251−3711 help bridge populations in the so-called neutron star zoo in an attempt to understand their origins and evolution.
Parkes Pulsar Timing Array constraints on ultralight scalar-field dark matter
Publisher: American Physical Society (APS)
Date: 05-11-2018
The High Time Resolution Universe Pulsar Survey – XVI. Discovery and timing of 40 pulsars from the southern Galactic plane
Publisher: Oxford University Press (OUP)
Date: 14-01-2020
Abstract: We present the results of processing an additional 44 per cent of the High Time Resolution Universe South Low Latitude (HTRU-S LowLat) pulsar survey, the most sensitive blind pulsar survey of the southern Galactic plane to date. Our partially coherent segmented acceleration search pipeline is designed to enable the discovery of pulsars in short, highly accelerated orbits, while our 72-min integration lengths will allow us to discover pulsars at the lower end of the pulsar luminosity distribution. We report the discovery of 40 pulsars, including three millisecond pulsar-white dwarf binary systems (PSRs J1537−5312, J1547−5709, and J1618−4624), a black-widow binary system (PSR J1745−23) and a candidate black-widow binary system (PSR J1727−2951), a glitching pulsar (PSR J1706−4434), an eclipsing binary pulsar with a 1.5-yr orbital period (PSR J1653−45), and a pair of long spin-period binary pulsars which display either nulling or intermittent behaviour (PSRs J1812−15 and J1831−04). We show that the total population of 100 pulsars discovered in the HTRU-S LowLat survey to date represents both an older and lower luminosity population, and indicates that we have yet to reach the bottom of the luminosity distribution function. We present evaluations of the performance of our search technique and of the overall yield of the survey, considering the 94 per cent of the survey which we have processed to date. We show that our pulsar yield falls below earlier predictions by approximately 25 per cent (especially in the case of millisecond pulsars), and discuss explanations for this discrepancy as well as future adaptations in RFI mitigation and searching techniques which may address these shortfalls.
High-fidelity Radio Astronomical Polarimetry Using a Millisecond Pulsar as a Polarized Reference Source
Publisher: American Astronomical Society
Date: 2013
Pulsars with the Australian Square Kilometre Array Pathfinder
Publisher: AIP
Date: 2011
DOI: 10.1063/1.3615151
Wide-band Timing of the Parkes Pulsar Timing Array UWL Data
Publisher: American Astronomical Society
Date: 02-2023
Abstract: In 2018 an ultra–wide-bandwidth low-frequency (UWL) receiver was installed on the 64 m Parkes Radio Telescope, enabling observations with an instantaneous frequency coverage from 704 to 4032 MHz. Here we present the analysis of a 3 yr data set of 35 ms pulsars observed with the UWL by the Parkes Pulsar Timing Array, using wide-band timing methods. The two key differences compared to typical narrowband methods are (1) generation of two-dimensional templates accounting for pulse shape evolution with frequency and (2) simultaneous measurements of the pulse time of arrival (TOA) and dispersion measure (DM). This is the first time that wide-band timing has been applied to a uniform data set collected with a single large fractional bandwidth receiver, for which such techniques were originally developed. As a result of our study, we present a set of profile evolution models and new timing solutions, including initial noise analysis. Precision of our TOA and DM measurements is in the range of 0.005–2.08 μ s and (0.043–14.24) × 10 −4 cm −3 pc, respectively, with 94% of the pulsars achieving a median TOA uncertainty of less than 1 μ s.
The High Time Resolution Universe Pulsar Survey –VIII. The Galactic millisecond pulsar population
Publisher: Oxford University Press (OUP)
Date: 18-07-2013
Interstellar holography
Publisher: Oxford University Press (OUP)
Date: 06-2008
High signal-to-noise ratio observations and the ultimate limits of precision pulsar timing
Publisher: Oxford University Press (OUP)
Date: 19-09-2011
The Thousand-Pulsar-Array programme on MeerKAT – II. Observing strategy for pulsar monitoring with subarrays
Publisher: Oxford University Press (OUP)
Date: 29-05-2021
Abstract: The Thousand-Pulsar-Array (TPA) programme currently monitors about 500 pulsars with the sensitive MeerKAT radio telescope by using subarrays to observe multiple sources simultaneously. Here we define the adopted observing strategy, which guarantees that each target is observed long enough to obtain a high-fidelity pulse profile, thereby reaching a sufficient precision of a simple pulse shape parameter. This precision is estimated from the contribution of the system noise of the telescope, and the pulse-to-pulse variability of each pulsar, which we quantify under some simplifying assumptions. We test the assumptions and choice of model parameters using data from the MeerKAT 64-dish array and the Lovell and Parkes telescopes. We demonstrate that the observing times derived from our method produce high-fidelity pulse profiles that meet the needs of the TPA in studying pulse shape variability and pulsar timing. Our method can also be used to compare strategies for observing large numbers of pulsars with telescopes capable of forming multiple subarray configurations. We find that using two 32-dish MeerKAT subarrays is the most efficient strategy for the TPA project. We also find that the ability to observe in different array configurations will become increasingly important for large observing programmes using the Square Kilometre Array telescope.
Alteration of the magnetosphere of the Vela pulsar during a glitch
Publisher: Springer Science and Business Media LLC
Date: 04-0004
DOI: 10.1038/S41586-018-0001-X
Abstract: As pulsars lose energy, primarily in the form of magnetic dipole radiation, their rotation slows down accordingly. For some pulsars, this spin-down is interrupted by occasional abrupt spin-up events known as glitches
A RADIO-LOUD MAGNETAR IN X-RAY QUIESCENCE
Publisher: American Astronomical Society
Date: 30-08-2010
Wide-band profile domain pulsar timing analysis
Publisher: Oxford University Press (OUP)
Date: 24-12-2017
Polarized Radio Emission from the Magnetar XTE J1810-197
Publisher: American Astronomical Society
Date: 14-03-2007
DOI: 10.1086/516630
PSR J2322−2650 – a low-luminosity millisecond pulsar with a planetary-mass companion
Publisher: Oxford University Press (OUP)
Date: 07-12-2017
Gravitational-Wave Limits from Pulsar Timing Constrain Supermassive Black Hole Evolution
Publisher: American Association for the Advancement of Science (AAAS)
Date: 18-10-2013
Abstract: Gravitational waves, predicted by General Relativity, are expected to be produced when very massive bodies, such as black holes, merge together. Shannon et al. (p. 334 ) used data from the Parkes Pulsar Timing Array project to estimate the gravitational wave background produced by pairs of supermassive black holes (those with masses between 10 6 and 10 11 that of the Sun) in merging galaxies. The results can be used to test models of the supermassive black hole population.
Development of a pulsar-based time-scale
Publisher: Oxford University Press (OUP)
Date: 21-12-2012
Base band data for testing interference mitigation algorithms
Publisher: Cambridge University Press (CUP)
Date: 2001
DOI: 10.1071/AS01006
Abstract: Digital signal processing is one of many valuable tools for suppressing unwanted signals or inter-ference. Building hardware processing engines seems to be the way to best implement some classes of interference suppression but is, unfortunately, expensive and time-consuming, especially if several miti-gation techniques need to be compared. Simulations can be useful, but are not a substitute for real data. CSIRO’s Australia Telescope National Facility has recently commenced a ‘software radio telescope’ project designed to fill the gap between dedicated hardware processors and pure simulation. In this approach, real telescope data are recorded coherently, then processed offline. This paper summarises the current contents of a freely available database of base band recorded data that can be used to experiment with signal processing solutions. It includes data from the following systems: single dish, multi-feed receiver single dish with reference antenna and an array of six 22 m antennas with and without a reference antenna. Astronomical sources such as OH masers, pulsars and continuum sources subject to interfering signals were recorded. The interfering signals include signals from the US Global Positioning System (GPS) and its Russian equivalent (GLONASS), television, microwave links, a low-Earth-orbit satellite, various other transmitters, and signals leaking from local telescope systems with fast clocks. The data are available on compact disk, allowing use in general purpose computers or as input to laboratory hardware prototypes.
Observations of Low-frequency Radio Emission from Millisecond Pulsars and Multipath Propagation in the Interstellar Medium
Publisher: American Astronomical Society
Date: 23-08-2018
The Parkes Pulsar Timing Array project: second data release
Publisher: Cambridge University Press (CUP)
Date: 2020
DOI: 10.1017/PASA.2020.11
Abstract: We describe 14 yr of public data from the Parkes Pulsar Timing Array (PPTA), an ongoing project that is producing precise measurements of pulse times of arrival from 26 millisecond pulsars using the 64-m Parkes radio telescope with a cadence of approximately 3 weeks in three observing bands. A comprehensive description of the pulsar observing systems employed at the telescope since 2004 is provided, including the calibration methodology and an analysis of the stability of system components. We attempt to provide full accounting of the reduction from the raw measured Stokes parameters to pulse times of arrival to aid third parties in reproducing our results. This conversion is encapsulated in a processing pipeline designed to track provenance. Our data products include pulse times of arrival for each of the pulsars along with an initial set of pulsar parameters and noise models. The calibrated pulse profiles and timing template profiles are also available. These data represent almost 21 000 h of recorded data spanning over 14 yr. After accounting for processes that induce time-correlated noise, 22 of the pulsars have weighted root-mean-square timing residuals of $ \\!\\!1\\,\\mu\\text{s}$ in at least one radio band. The data should allow end users to quickly undertake their own gravitational wave analyses, for ex le, without having to understand the intricacies of pulsar polarisation calibration or attain a mastery of radio frequency interference mitigation as is required when analysing raw data files.
High-resolution single-pulse studies of the Vela pulsar
Publisher: Oxford University Press (OUP)
Date: 11-08-2002
PSRCHIVE and PSRFITS: Definition of the Stokes Parameters and Instrumental Basis Conventions
Publisher: Cambridge University Press (CUP)
Date: 2010
DOI: 10.1071/AS09084
Abstract: This paper defines the mathematical convention adopted to describe an electromagnetic wave and its polarisation state, as implemented in the psrchive software and represented in the psrfits definition. Contrast is made between the convention that has been widely accepted by pulsar astronomers and the IAU/IEEE definitions of the Stokes parameters. The former is adopted as the PSR/IEEE convention, and a set of useful parameters are presented for describing the differences between the PSR/IEEE standard and the conventions (either implicit or explicit) that form part of the design of observatory instrumentation. To aid in the empirical determination of instrumental convention parameters, well-calibrated average polarisation profiles of PSR J0304+1932 and PSR J0742–2822 are presented at radio wavelengths of approximately 10, 20, and 40 cm.
The High Time Resolution Universe pulsar survey - X. Discovery of four millisecond pulsars and updated timing solutions of a further 12
Publisher: Oxford University Press (OUP)
Date: 17-02-2014
DOI: 10.1093/MNRAS/STU067
The High Time Resolution Universe Pulsar Survey - II. Discovery of five millisecond pulsars
Publisher: Oxford University Press (OUP)
Date: 02-09-2011
Precision Timing of PSR J0437-4715: An Accurate Pulsar Distance, a High Pulsar Mass, and a Limit on the Variation of Newton's Gravitational Constant
Publisher: American Astronomical Society
Date: 20-05-2008
DOI: 10.1086/529576
Are the distributions of fast radio burst properties consistent with a cosmological population?
Publisher: Oxford University Press (OUP)
Date: 09-03-2016
DOI: 10.1093/MNRAS/STW175
Commensal discovery of four fast radio bursts during Parkes Pulsar Timing Array observations
Publisher: Oxford University Press (OUP)
Date: 28-06-2019
Abstract: The Parkes Pulsar Timing Array (PPTA) project monitors two dozen millisecond pulsars (MSPs) in order to undertake a variety of fundamental physics experiments using the Parkes 64-m radio telescope. Since 2017 June, we have been undertaking commensal searches for fast radio bursts (FRBs) during the MSP observations. Here, we report the discovery of four FRBs (171209, 180309, 180311, and 180714). The detected events include an FRB with the highest signal-to-noise ratio ever detected at the Parkes Observatory, which exhibits unusual spectral properties. All four FRBs are highly polarized. We discuss the future of commensal searches for FRBs at Parkes.
The High Time Resolution Universe Pulsar Survey — VI. An artificial neural network and timing of 75 pulsars
Publisher: Oxford University Press (OUP)
Date: 12-2012
Limitations in timing precision due to single-pulse shape variability in millisecond pulsars
Publisher: Oxford University Press (OUP)
Date: 21-07-2014
AN ABSENCE OF FAST RADIO BURSTS AT INTERMEDIATE GALACTIC LATITUDES
Publisher: American Astronomical Society
Date: 20-06-2014
Radio emission evolution, polarimetry and multifrequency single pulse analysis of the radio magnetar PSR J1622−4950
Publisher: Oxford University Press (OUP)
Date: 04-04-2012
Independent Discovery of a Nulling Pulsar with Unusual Subpulse Drifting Properties with the Murchison Widefield Array
Publisher: American Astronomical Society
Date: 07-2022
Abstract: We report the independent discovery of PSR J0026-1955 with the Murchison Widefield Array (MWA) in the ongoing Southern-sky MWA Rapid Two-metre pulsar survey. J0026-1955 has a period of ∼1.306 s, a dispersion measure of ∼20.869 pc cm −3 , and a nulling fraction of ∼77%. This pulsar highlights the advantages of the survey's long dwell times (∼80 minutes), which, when fully searched, will be sensitive to the expected population of similarly bright, intermittent pulsars with long nulls. A single-pulse analysis in the MWA's 140–170 MHz band also reveals a complex subpulse drifting behavior, including both rapid changes of the drift rate characteristic of mode switching pulsars, as well as a slow, consistent evolution of the drift rate within modes. In some longer drift sequences, interruptions in the otherwise smooth drift rate evolution occur preferentially at a particular phase, typically lasting a few pulses. These properties make this pulsar an ideal test bed for prevailing models of drifting behavior such as the carousel model.
Revival of the Magnetar PSR J1622–4950: Observations with MeerKAT, Parkes,XMM-Newton,Swift,Chandra, andNuSTAR
Publisher: American Astronomical Society
Date: 05-04-2018
Measurements of pulse jitter and single-pulse variability in millisecond pulsars using MeerKAT
Publisher: Oxford University Press (OUP)
Date: 08-01-2021
Abstract: Using the state-of-the-art SKA precursor, the MeerKAT radio telescope, we explore the limits to precision pulsar timing of millisecond pulsars achievable due to pulse stochasticity (jitter). We report new jitter measurements in 15 of the 29 pulsars in our s le and find that the levels of jitter can vary dramatically between them. For some, like the 2.2 ms pulsar PSR J2241−5236, we measure an implied jitter of just ∼4 ns h−1, while others, like the 3.9 ms PSR J0636−3044, are limited to ∼100 ns h−1. While it is well known that jitter plays a central role to limiting the precision measurements of arrival times for high signal-to-noise ratio observations, its role in the measurement of dispersion measure (DM) has not been reported, particularly in broad-band observations. Using the exceptional sensitivity of MeerKAT, we explored this on the bright millisecond pulsar PSR J0437−4715 by exploring the DM of literally every pulse. We found that the derived single-pulse DMs vary by typically 0.0085 cm−3 pc from the mean, and that the best DM estimate is limited by the differential pulse jitter across the band. We postulate that all millisecond pulsars will have their own limit on DM precision which can only be overcome with longer integrations. Using high-time resolution filterbank data of 9 μs, we also present a statistical analysis of single-pulse phenomenology. Finally, we discuss optimization strategies for the MeerKAT pulsar timing program and its role in the context of the International Pulsar Timing Array.
Polarization studies of rotating radio transients
Publisher: Oxford University Press (OUP)
Date: 16-05-2019
Abstract: We study the polarization properties of 22 known rotating radio transients (RRATs) with the 64-m Parkes radio telescope and present the Faraday rotation measures (RMs) for the 17 with linearly polarized flux exceeding the off-pulse noise by 3σ. Each RM was estimated using a brute-force search over trial RMs that spanned the maximum measurable range $\pm 1.18 \times 10^5 \, \mathrm{rad \, m^2}$ (in steps of 1 $\mathrm{rad \, m^2}$), followed by an iterative refinement algorithm. The measured RRAT RMs are in the range |RM| 1–950 rad m−2 with an average linear polarization fraction of 40 per cent. In idual single pulses are observed to be up to 100 per cent linearly polarized. The RMs of the RRATs and the corresponding inferred average magnetic fields (parallel to the line of sight and weighted by the free electron density) are observed to be consistent with the Galactic plane pulsar population. Faraday rotation analyses are typically performed on accumulated pulsar data, for which hundreds to thousands of pulses have been integrated, rather than on in idual pulses. Therefore, we verified the iterative refinement algorithm by performing Monte Carlo simulations of artificial single pulses over a wide range of S/N and RM. At and above an S/N of 17 in linearly polarized flux, the iterative refinement recovers the simulated RM value 100 per cent of the time with a typical mean uncertainty of 5 rad m−2. The method described and validated here has also been successfully used to determine reliable RMs of several fast radio bursts (FRBs) discovered at Parkes.
Dispersion measure variations in a sample of 168 pulsars
Publisher: Oxford University Press (OUP)
Date: 22-08-2013
The High Time Resolution Universe Pulsar Survey - V. Single-pulse energetics and modulation properties of 315 pulsars
Publisher: Oxford University Press (OUP)
Date: 24-04-2012
Studying the Solar system with the International Pulsar Timing Array
Publisher: Oxford University Press (OUP)
Date: 10-2018
The High Time Resolution Universe survey – XIV. Discovery of 23 pulsars through GPU-accelerated reprocessing
Publisher: Oxford University Press (OUP)
Date: 07-12-2018
The Statistics of Radio Astronomical Polarimetry: Disjoint, Superposed, and Composite Samples
Publisher: American Astronomical Society
Date: 02-02-2017
Giant pulses from the Crab pulsar
Publisher: EDP Sciences
Date: 06-2010
Searching for gravitational wave memory bursts with the Parkes Pulsar Timing Array
Publisher: Oxford University Press (OUP)
Date: 20-11-2014
The sensitivity of the Parkes Pulsar Timing Array to individual sources of gravitational waves
Publisher: Oxford University Press (OUP)
Date: 14-06-2010
The High Time Resolution Universe Pulsar Survey - III. Single-pulse searches and preliminary analysis
Publisher: Oxford University Press (OUP)
Date: 02-09-2011
Tracking dispersion measure variations of timing array pulsars with the GMRT
Publisher: Cambridge University Press (CUP)
Date: 08-2012
DOI: 10.1017/S1743921312024404
Abstract: We present the results from nearly three years of monitoring of the variations in dispersion measure (DM) along the line-of-sight to 11 millisecond pulsars using the Giant Metrewave Radio Telescope (GMRT). These results demonstrate accuracies of single epoch DM estimates of the order of 5 × 10 −4 cm −3 pc. A preliminary comparison with the Parkes Pulsar Timing Array (PPTA) data shows that the measured DM fluctuations are comparable. We show effects of DM variations due to the solar wind and solar corona and compare with the existing models.
The statistics of radio astronomical polarimetry: Bright sources and high time resolution
Publisher: American Astronomical Society
Date: 24-03-2009
The UTMOST survey for magnetars, intermittent pulsars, RRATs, and FRBs – I. System description and overview
Publisher: Oxford University Press (OUP)
Date: 15-01-2020
Abstract: We describe the ongoing ‘survey for magnetars, intermittent pulsars, rotating radio transients, and fast radio bursts’ (SMIRF), performed using the newly refurbished UTMOST telescope. SMIRF repeatedly sweeps the southern Galactic plane performing real-time periodicity and single pulse searches, and is the first survey of its kind carried out with an interferometer. SMIRF is facilitated by a robotic scheduler which is capable of fully autonomous commensal operations. We report on the SMIRF observational parameters, the data analysis methods, the survey’s sensitivity to pulsars, techniques to mitigate radio frequency interference, and present some early survey results. UTMOST’s wide field of view permits a full sweep of the Galactic plane to be performed every fortnight, two orders of magnitude faster than previous surveys. In six months of operations from 2018 January to June, we have performed ∼10 sweeps of the Galactic plane with SMIRF. Notable blind redetections include the magnetar PSR J1622−4950, the RRAT PSR J0941−3942 and the eclipsing pulsar PSR J1748−2446A. We also report the discovery of a new pulsar, PSR J1659−54. Our follow-up of this pulsar at an average flux limit of ≤20 mJy, categorizes this as an intermittent pulsar with a high nulling fraction of & .002.
The Parkes Pulsar Timing Array Project
Publisher: Cambridge University Press (CUP)
Date: 2013
Abstract: A ‘pulsar timing array’ (PTA), in which observations of a large s le of pulsars spread across the celestial sphere are combined, allows investigation of ‘global’ phenomena such as a background of gravitational waves or instabilities in atomic timescales that produce correlated timing residuals in the pulsars of the array. The Parkes Pulsar Timing Array (PPTA) is an implementation of the PTA concept based on observations with the Parkes 64-m radio telescope. A s le of 20 ms pulsars is being observed at three radio-frequency bands, 50 cm (~700 MHz), 20 cm (~1400 MHz), and 10 cm (~3100 MHz), with observations at intervals of two to three weeks. Regular observations commenced in early 2005. This paper describes the systems used for the PPTA observations and data processing, including calibration and timing analysis. The strategy behind the choice of pulsars, observing parameters, and analysis methods is discussed. Results are presented for PPTA data in the three bands taken between 2005 March and 2011 March. For 10 of the 20 pulsars, rms timing residuals are less than 1 μs for the best band after fitting for pulse frequency and its first time derivative. Significant ‘red’ timing noise is detected in about half of the s le. We discuss the implications of these results on future projects including the International Pulsar Timing Array and a PTA based on the Square Kilometre Array. We also present an ‘extended PPTA’ data set that combines PPTA data with earlier Parkes timing data for these pulsars.
Relativistic Spin Precession in the Binary PSR J1141−6545
Publisher: American Astronomical Society
Date: 11-03-2019
Comparison of pulsar positions from timing and very long baseline astrometry
Publisher: Oxford University Press (OUP)
Date: 05-04-2017
DOI: 10.1093/MNRAS/STX837
A search for submillisecond pulsars
Publisher: American Astronomical Society
Date: 10-10-2001
DOI: 10.1086/322772
Improving the precision of pulsar timing through polarization statistics
Publisher: Oxford University Press (OUP)
Date: 18-01-2013
DOI: 10.1093/MNRAS/STS662
HIPSR: A Digital Signal Processor for the Parkes 21-cm Multibeam Receiver
Publisher: World Scientific Pub Co Pte Ltd
Date: 12-2016
DOI: 10.1142/S2251171716410075
Abstract: HIPSR (HI-Pulsar) is a digital signal processing system for the Parkes 21-cm Multibeam Receiver that provides larger instantaneous bandwidth, increased dynamic range, and more signal processing power than the previous systems in use at Parkes. The additional computational capacity enables finer spectral resolution in wideband HI observations and real-time detection of Fast Radio Bursts during pulsar surveys. HIPSR uses a heterogeneous architecture, consisting of FPGA-based signal processing boards connected via high-speed Ethernet to high performance compute nodes. Low-level signal processing is conducted on the FPGA-based boards, and more complex signal processing routines are conducted on the GPU-based compute nodes. The development of HIPSR was driven by two main science goals: to provide large bandwidth, high-resolution spectra suitable for 21-cm stacking and intensity mapping experiments and to upgrade the Berkeley–Parkes–Swinburne Recorder (BPSR), the signal processing system used for the High Time Resolution Universe (HTRU) Survey and the Survey for Pulsars and Extragalactic Radio Bursts (SUPERB).
Radio Astronomical Polarimetry and High‐Precision Pulsar Timing
Publisher: American Astronomical Society
Date: 10-05-2006
DOI: 10.1086/501001
MEASURING THE MASS OF SOLAR SYSTEM PLANETS USING PULSAR TIMING
Publisher: American Astronomical Society
Date: 23-08-2010
Fast Radio Transient searches with UTMOST at 843 MHz
Publisher: Oxford University Press (OUP)
Date: 09-03-2016
DOI: 10.1093/MNRAS/STW109
The PULSE@Parkes Project: a New Observing Technique for Long-Term Pulsar Monitoring
Publisher: Cambridge University Press (CUP)
Date: 2009
DOI: 10.1071/AS09021
Abstract: The PULSE@Parkes project has been designed to monitor the rotation of radio pulsars over time spans of days to years. The observations are obtained using the Parkes 64-m and 12-m radio telescopes by Australian and international high school students. These students learn the basis of radio astronomy and undertake small projects with their observations. The data are fully calibrated and obtained with the state-of-the-art pulsar hardware available at Parkes. The final data sets are archived and are currently being used to carry out studies of 1) pulsar glitches, 2) timing noise, 3) pulse profile stability over long time scales and 4) the extreme nulling phenomenon. The data are also included in other projects such as gamma-ray observatory support and for the Parkes Pulsar Timing Array project. In this paper we describe the current status of the project and present the first scientific results from the Parkes 12-m radio telescope. We emphasise that this project offers a straightforward means to enthuse high school students and the general public about radio astronomy while obtaining scientifically valuable data sets.
The International Pulsar Timing Array: First data release
Publisher: Oxford University Press (OUP)
Date: 15-02-2016
DOI: 10.1093/MNRAS/STW347
From spin noise to systematics: stochastic processes in the first International Pulsar Timing Array data release
Publisher: Oxford University Press (OUP)
Date: 19-02-2016
DOI: 10.1093/MNRAS/STW395
The UTMOST pulsar timing programme I: Overview and first results
Publisher: Oxford University Press (OUP)
Date: 14-12-2018
Timing of young radio pulsars – I. Timing noise, periodic modulation, and proper motion
Publisher: Oxford University Press (OUP)
Date: 30-08-2019
Abstract: The smooth spin-down of young pulsars is perturbed by two non-deterministic phenomenon, glitches, and timing noise. Although the timing noise provides insights into nuclear and plasma physics at extreme densities, it acts as a barrier to high-precision pulsar timing experiments. An improved methodology based on the Bayesian inference is developed to simultaneously model the stochastic and deterministic parameters for a s le of 85 high-$\dot{E}$ radio pulsars observed for ∼10 yr with the 64-m Parkes radio telescope. Timing noise is known to be a red process and we develop a parametrization based on the red-noise litude (Ared) and spectral index (β). We measure the median Ared to be $-10.4^{+1.8}_{-1.7}$ yr3/2 and β to be $-5.2^{+3.0}_{-3.8}$ and show that the strength of timing noise scales proportionally to $\nu ^{1}|\dot{\nu }|^{-0.6\pm 0.1}$, where ν is the spin frequency of the pulsar and $\dot{\nu }$ is its spin-down rate. Finally, we measure significant braking indices for 19 pulsars and proper motions for 2 pulsars, and discuss the presence of periodic modulation in the arrival times of 5 pulsars.
A Population of Fast Radio Bursts at Cosmological Distances
Publisher: American Association for the Advancement of Science (AAAS)
Date: 05-07-2013
Abstract: It has been uncertain whether single, short, and bright bursts of radio emission that have been observed are celestial or terrestrial in origin. Thornton et al. (p. 53 see the Perspective by Cordes ) report the detection of four nonrepeating radio transient events with millisecond duration in data from the 64-meter Parkes radio telescope in Australia. The properties of these radio bursts indicate that they had their origin outside our galaxy, but it is not possible to tell what caused them. Because the intergalactic medium affects the characteristics of the bursts, it will be possible to use them to study its properties.
POLARIZATION OBSERVATIONS OF 100 PULSARS AT 774 MHz BY THE GREEN BANK TELESCOPE
Publisher: American Astronomical Society
Date: 24-03-2009
Dispatch approaches for scheduling radio telescope observations
Publisher: Springer Science and Business Media LLC
Date: 26-09-2018
DSPSR: Digital signal processing software for pulsar astronomy
Publisher: Cambridge University Press (CUP)
Date: 2011
DOI: 10.1071/AS10021
Abstract: dspsr is a high-performance, open-source, object-oriented, digital signal processing software library and application suite for use in radio pulsar astronomy. Written primarily in C++, the library implements an extensive range of modular algorithms that can optionally exploit both multiple-core processors and general-purpose graphics processing units. After over a decade of research and development, dspsr is now stable and in widespread use in the community. This paper presents a detailed description of its functionality, justification of major design decisions, analysis of phase-coherent dispersion removal algorithms, and demonstration of performance on some contemporary microprocessor architectures.
Timing of young radio pulsars - II. Braking indices and their interpretation
Publisher: Oxford University Press (OUP)
Date: 09-04-2020
Abstract: In Paper I of this series, we detected a significant value of the braking index (n) for 19 young, high-$\\dot{E}$ radio pulsars using ∼10 yr of timing observations from the 64-m Parkes radio telescope. Here, we investigate this result in more detail using a Bayesian pulsar timing framework to model timing noise and to perform selection to distinguish between models containing exponential glitch recovery and braking index signatures. We show that consistent values of n are maintained with the addition of substantial archival data, even in the presence of glitches. We provide strong arguments that our measurements are unlikely due to exponential recovery signals from unseen glitches even though glitches play a key role in the evolution of a pulsar’s spin frequency. We conclude that, at least over decadal time-scales, the value of n can be significantly larger than the canonical 3 and discuss the implications for the evolution of pulsars.
A study of multifrequency polarization pulse profiles of millisecond pulsars
Publisher: Oxford University Press (OUP)
Date: 29-08-2015
DOI: 10.1093/MNRAS/STV508
OBSERVATIONS AND MODELING OF RELATIVISTIC SPIN PRECESSION IN PSR J1141–6545
Publisher: American Astronomical Society
Date: 02-02-2010
The SUrvey for Pulsars and Extragalactic Radio Bursts – II. New FRB discoveries and their follow-up
Publisher: Oxford University Press (OUP)
Date: 27-11-2017
Gravitational waves from binary supermassive black holes missing in pulsar observations
Publisher: American Association for the Advancement of Science (AAAS)
Date: 25-09-2015
Abstract: Gravitational waves are expected to be generated by the interaction of the massive bodies in black-hole binary systems. As gravitational waves distort spacetime, it should be possible to verify their existence as they interfere with the pulses emitted by millisecond pulsars. However, after monitoring 24 pulsars with the Parkes radio telescope for 12 years, Shannon et al. found no detectable variation in pulsar records. This nondetection result indicates that a new detection strategy for gravitational waves is needed. Science , this issue p. 1522
A survey of FRB fields: limits on repeatability
Publisher: Oxford University Press (OUP)
Date: 22-09-2015
The High Time Resolution Universe Pulsar Survey – VII. Discovery of five millisecond pulsars and the different luminosity properties of binary and isolated recycled pulsars
Publisher: Oxford University Press (OUP)
Date: 21-05-2013
DOI: 10.1093/MNRAS/STT721
psrchive and psrfits : An Open Approach to Radio Pulsar Data Storage and Analysis
Publisher: Cambridge University Press (CUP)
Date: 2004
DOI: 10.1071/AS04022
Abstract: A new set of software applications and libraries for use in the archival and analysis of pulsar astronomical data is introduced. Known collectively as the psrchive scheme, the code was developed in parallel with a new data storage format called psrfits , which is based on the Flexible Image Transport System (FITS). Both of these projects utilise a modular, object-oriented design philosophy. psrchive is an open source development environment that incorporates an extensive range of c ++ object classes and pre-built command line and graphical utilities. These deal transparently and simultaneously with multiple data storage formats, thereby enhancing data portability and facilitating the adoption of the psrfits file format. Here, data are stored in a series of modular header–data units that provide flexibility and scope for future expansion. As it is based on FITS, various standard libraries and applications may be used for data input, output, and visualisation. Both psrchive and psrfits are made publicly available to the academic community in the hope that this will promote their widespread use and acceptance.
The Thousand-Pulsar-Array programme on MeerKAT – III. Giant pulse characteristics of PSR J0540−6919
Publisher: Oxford University Press (OUP)
Date: 29-05-2021
Abstract: PSR J0540−6919 is the second-most energetic radio pulsar known and resides in the Large Magellanic Cloud. Like the Crab pulsar, it is observed to emit giant radio pulses (GPs). We used the newly commissioned PTUSE instrument on the MeerKAT radio telescope to search for GPs across three observations. In a total integration time of 5.7 h, we detected 865 pulses above our 7σ threshold. With full polarization information for a subset of the data, we estimated the Faraday rotation measure, $\\rm {RM}=-245.8 \\pm 1.0$ rad m−2 towards the pulsar. The brightest of these pulses is ∼60 per cent linearly polarized but the pulse-to-pulse variability in the polarization fraction is significant. We find that the cumulative GP flux distribution follows a power-law distribution with index −2.75 ± 0.02. Although the detected GPs make up only ∼10 per cent of the mean flux, their average pulse shape is indistinguishable from the integrated pulse profile, and we postulate that, unlike in the Crab pulsar, there are no additional regular emission components. The pulses are scattered at L-band frequencies with the brightest pulse exhibiting a scattering time-scale of τ = 0.92 ± 0.02 ms at 1.2 GHz. We find several of the giants display very narrow-band flux knots similar to those seen in many Fast Radio Bursts, which we assert cannot be due to scintillation or plasma lensing. The GP time-of-arrival distribution is found to be Poissonian on all but the shortest time-scales where we find four GPs in six rotations, which if GPs are statistically independent is expected to occur in only 1 of 7000 observations equivalent to our data.
Pulsar rotation measures and large-scale magnetic field reversals in the galactic disk
Publisher: American Astronomical Society
Date: 16-01-2018
Polarization observations of 20 millisecond pulsars
Publisher: Oxford University Press (OUP)
Date: 02-03-2019
SPINN: a straightforward machine learning solution to the pulsar candidate selection problem
Publisher: Oxford University Press (OUP)
Date: 25-07-2014
A fast radio burst with a low dispersion measure
Publisher: Oxford University Press (OUP)
Date: 27-10-2018
The Thousand-Pulsar-Array programme on MeerKAT – V. Scattering analysis of single-component pulsars
Publisher: Oxford University Press (OUP)
Date: 16-04-2021
Abstract: We have measured the scattering time-scale, τ, and the scattering spectral index, α, for 84 single-component pulsars. Observations were carried out with the MeerKAT telescope as part of the Thousand-Pulsar-Array programme in the MeerTime project at frequencies between 0.895 and 1.670 GHz. Our results give a distribution of values for α (defined in terms of τ and frequency ν as τ ∝ ν−α) for which, upon fitting a Gaussian, we obtain a mean and standard deviation of 〈α〉 = 4.0 ± 0.6. This is due to our identification of possible causes of inaccurate measurement of τ, which, if not filtered out of modelling results, tend to lead to underestimation of α. The pulsars in our s le have large dispersion measures and are therefore likely to be distant. We find that a model using an isotropic scatter broadening function is consistent with the data, likely due to the averaging effect of multiple scattering screens along the line of sight. Our s le of scattering parameters provides a strong data set upon which we can build to test more complex and time-dependent scattering phenomena, such as extreme scattering events.
High Time Resolution Observations of the Vela Pulsar
Publisher: American Astronomical Society
Date: 03-2001
DOI: 10.1086/319154
Detection of Frequency-dependent Dispersion Measure toward the Millisecond Pulsar J2241–5236 from Contemporaneous Wideband Observations
Publisher: American Astronomical Society
Date: 05-2022
Abstract: Making precise measurements of pulsar dispersion measures (DMs) and applying suitable corrections for them is among the major challenges in high-precision timing programs such as pulsar timing arrays (PTAs). While the advent of wideband pulsar instrumentation can enable more precise DM measurements and thence improved timing precision, it also necessitates doing careful assessments of frequency-dependent (chromatic) DMs that were theorized by Cordes et al (2016). Here we report the detection of such an effect in broadband observations of the millisecond pulsar PSR J2241−5236, a high-priority target for current and future PTAs. The observations were made contemporaneously using the wideband receivers and capabilities now available at the Murchison Widefield Array, the upgraded Giant Metrewave Radio Telescope, and the Parkes telescopes, thus providing an unprecedentedly large frequency coverage from 80 MHz to 4 GHz. Our analysis shows the measurable changes in DM that scale with the observing frequency ( ν ) as δ DM ∝ ν 2.5±0.1 . We discuss the potential implications of such a frequency dependence in the measured DMs and the likely impact on the timing noise budget and comment on the usefulness of low-frequency observations in advancing PTA efforts.
The SUrvey for Pulsars and Extragalactic Radio Bursts – III. Polarization properties of FRBs 160102 and 151230
Publisher: Oxford University Press (OUP)
Date: 03-05-2018
The High Time Resolution Universe Pulsar Survey – XIII. PSR J1757−1854, the most accelerated binary pulsar
Publisher: Oxford University Press (OUP)
Date: 09-01-2018
Five new fast radio bursts from the HTRU high-latitude survey at Parkes: first evidence for two-component bursts
Publisher: Oxford University Press (OUP)
Date: 11-04-2016
The High Time Resolution Universe Pulsar Survey - I. System configuration and initial discoveries
Publisher: Oxford University Press (OUP)
Date: 14-09-2010
The High Time Resolution Universe: The latest survey for pulsars at Parkes
Publisher: AIP
Date: 2011
DOI: 10.1063/1.3615067
Measurement and correction of variations in interstellar dispersion in high-precision pulsar timing
Publisher: Oxford University Press (OUP)
Date: 22-12-2012
DOI: 10.1093/MNRAS/STS486
Timing stability of millisecond pulsars and prospects for gravitational-wave detection
Publisher: Oxford University Press (OUP)
Date: 12-2009
The Discovery of 5 Millisecond Pulsars in the High Time Resolution Universe Survey
Publisher: AIP
Date: 2011
DOI: 10.1063/1.3615068
Improving pulsar polarization and timing measurements with the Nançay Radio Telescope
Publisher: EDP Sciences
Date: 28-08-2023
A fast radio burst with frequency-dependent polarization detected during Breakthrough Listen observations
Publisher: Oxford University Press (OUP)
Date: 08-04-2019
DOI: 10.1093/MNRAS/STZ958
Abstract: Here, we report on the detection and verification of fast radio burst FRB 180301, which occurred on utc 2018 March 1 during the Breakthrough Listen observations with the Parkes telescope. Full-polarization voltage data of the detection were captured – a first for non-repeating FRBs – allowing for coherent de-dispersion and additional verification tests. The coherently de-dispersed dynamic spectrum of FRB 180301 shows complex, polarized frequency structure over a small fractional bandwidth. As FRB 180301 was detected close to the geosynchronous satellite band during a time of known 1–2 GHz satellite transmissions, we consider whether the burst was due to radio interference emitted or reflected from an orbiting object. Based on the pre-ponderance of our verification tests, we cannot conclusively determine FRB 180301 to be either astrophysical or anthropogenic in origin.
The host galaxy of a fast radio burst
Publisher: Springer Science and Business Media LLC
Date: 02-2016
DOI: 10.1038/NATURE17140
Abstract: In recent years, millisecond-duration radio signals originating in distant galaxies appear to have been discovered in the so-called fast radio bursts. These signals are dispersed according to a precise physical law and this dispersion is a key observable quantity, which, in tandem with a redshift measurement, can be used for fundamental physical investigations. Every fast radio burst has a dispersion measurement, but none before now have had a redshift measurement, because of the difficulty in pinpointing their celestial coordinates. Here we report the discovery of a fast radio burst and the identification of a fading radio transient lasting ~6 days after the event, which we use to identify the host galaxy we measure the galaxy's redshift to be z = 0.492 ± 0.008. The dispersion measure and redshift, in combination, provide a direct measurement of the cosmic density of ionized baryons in the intergalactic medium of ΩIGM = 4.9 ± 1.3 per cent, in agreement with the expectation from the Wilkinson Microwave Anisotropy Probe, and including all of the so-called 'missing baryons'. The ~6-day radio transient is largely consistent with the radio afterglow of a short γ-ray burst, and its existence and timescale do not support progenitor models such as giant pulses from pulsars, and supernovae. This contrasts with the interpretation of another recently discovered fast radio burst, suggesting that there are at least two classes of bursts.
The High Time Resolution Universe survey – IX. Polarimetry of long-period pulsars
Publisher: Oxford University Press (OUP)
Date: 24-10-2013
A suite of domain-specific visual languages for scientific software application modelling
Publisher: IEEE
Date: 09-2013
The High Time Resolution Universe Pulsar Survey – XII. Galactic plane acceleration search and the discovery of 60 pulsars
Publisher: Oxford University Press (OUP)
Date: 03-2018
DOI: 10.1093/MNRAS/STV753
Lense-Thirring frame dragging induced by a fast-rotating white dwarf in a binary pulsar system.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 31-01-2020
Abstract: Radio pulsars in short-period eccentric binary orbits can be used to study both gravitational dynamics and binary evolution. The binary system containing PSR J1141-6545 includes a massive white dwarf (WD) companion that formed before the gravitationally bound young radio pulsar. We observed a temporal evolution of the orbital inclination of this pulsar that we infer is caused by a combination of a Newtonian quadrupole moment and Lense-Thirring (LT) precession of the orbit resulting from rapid rotation of the WD. LT precession, an effect of relativistic frame dragging, is a prediction of general relativity. This detection is consistent with an evolutionary scenario in which the WD accreted matter from the pulsar progenitor, spinning up the WD to a period of <200 seconds.
Erratum: The High Time Resolution Universe survey – IX. Polarimetry of long-period pulsars
Publisher: Oxford University Press (OUP)
Date: 24-10-2014
The High Time Resolution Universe Pulsar Survey – XV. Completion of the intermediate-latitude survey with the discovery and timing of 25 further pulsars
Publisher: Oxford University Press (OUP)
Date: 11-02-2019
DOI: 10.1093/MNRAS/STZ401
The MeerTime Pulsar Timing Array: A census of emission properties and timing potential
Publisher: Cambridge University Press (CUP)
Date: 2022
DOI: 10.1017/PASA.2022.19
Abstract: MeerTime is a five-year Large Survey Project to time pulsars with MeerKAT, the 64-dish South African precursor to the Square Kilometre Array. The science goals for the programme include timing millisecond pulsar (MSPs) to high precision ( ${ } 1 \\unicode{x03BC} \\mathrm{s}$ ) to study the Galactic MSP population and to contribute to global efforts to detect nanohertz gravitational waves with the International Pulsar Timing Array (IPTA). In order to plan for the remainder of the programme and to use the allocated time most efficiently, we have conducted an initial census with the MeerKAT ‘ L -band’ receiver of 189 MSPs visible to MeerKAT and here present their dispersion measures, polarisation profiles, polarisation fractions, rotation measures, flux density measurements, spectral indices, and timing potential. As all of these observations are taken with the same instrument (which uses coherent dedispersion, interferometric polarisation calibration techniques, and a uniform flux scale), they present an excellent resource for population studies. We used wideband pulse portraits as timing standards for each MSP and demonstrated that the MeerTime Pulsar Timing Array (MPTA) can already contribute significantly to the IPTA as it currently achieves better than $1\\,\\unicode{x03BC}\\mathrm{s}$ timing accuracy on 89 MSPs (observed with fortnightly cadence). By the conclusion of the initial five-year MeerTime programme in 2024 July, the MPTA will be extremely significant in global efforts to detect the gravitational wave background with a contribution to the detection statistic comparable to other long-standing timing programmes.
Pulsar Rotation Measures and the Large‐Scale Structure of the Galactic Magnetic Field
Publisher: American Astronomical Society
Date: 10-05-2006
DOI: 10.1086/501444
Toward an Empirical Theory of Pulsar Emission. XII. Exploring the Physical Conditions in Millisecond Pulsar Emission Regions
Publisher: American Astronomical Society
Date: 09-08-2017
Spectral properties of 441 radio pulsars
Publisher: Oxford University Press (OUP)
Date: 02-10-2017
Prospects for high-precision pulsar timing
Publisher: Oxford University Press (OUP)
Date: 12-09-2011
Timing analysis for 20 millisecond pulsars in the Parkes Pulsar Timing Array
Publisher: Oxford University Press (OUP)
Date: 18-11-2015
The High Time Resolution Universe survey – XI. Discovery of five recycled pulsars and the optical detectability of survey white dwarf companions
Publisher: Oxford University Press (OUP)
Date: 09-12-2014
PuMa-II: A Wide Band Pulsar Machine for the Westerbork Synthesis Radio Telescope
Publisher: IOP Publishing
Date: 02-2008
DOI: 10.1086/528699
Cyclic spectroscopy of the millisecond pulsar, B1937+21
Publisher: American Astronomical Society
Date: 27-11-2013
The thousand-pulsar-array programme on MeerKAT IV: Polarization properties of young, energetic pulsars
Publisher: Oxford University Press (OUP)
Date: 29-05-2021
Abstract: We present observations of 35 high spin-down energy radio pulsars using the MeerKAT telescope. Polarization profiles and associated parameters are also presented. We derive the geometry for a selection of pulsars which show interpulse emission. We point out that, in several cases, these radio pulsars should also be seen in γ-rays but that improved radio timing is required to aid the high-energy detection. We discuss the relationship between the width of the radio profile and its high-energy detectability. Finally, we reflect on the correlation between the spin-down energy and the radio polarization fraction and the implications this may have for γ-ray emission.
The High Time Resolution Universe Pulsar Survey - IV. Discovery and polarimetry of millisecond pulsars
Publisher: Oxford University Press (OUP)
Date: 03-11-2011
The International Pulsar Timing Array project: using pulsars as a gravitational wave detector
Publisher: IOP Publishing
Date: 06-04-2010
The SUrvey for Pulsars and Extragalactic Radio Bursts – I. Survey description and overview
Publisher: Oxford University Press (OUP)
Date: 17-08-2017
Status update of the Parkes pulsar timing array
Publisher: IOP Publishing
Date: 06-04-2010
A shapiro delay detection in the binary system hosting the millisecond pulsar PSR J1910–5959A
Publisher: American Astronomical Society
Date: 08-11-2012
Timing, polarimetry and physics of the bright, nearby millisecond pulsar PSR J0437−4715 – a single-pulse perspective
Publisher: Oxford University Press (OUP)
Date: 27-05-2014
DOI: 10.1093/MNRAS/STU804
PULSAR OBSERVATIONS OF EXTREME SCATTERING EVENTS
Publisher: American Astronomical Society
Date: 27-07-2015
Versatile directional searches for gravitational waves with Pulsar Timing Arrays
Publisher: Oxford University Press (OUP)
Date: 12-2015
Measuring the mass of solar system planets using pulsar timing
Publisher: AIP
Date: 2011
DOI: 10.1063/1.3615087
THE DISTURBANCE OF A MILLISECOND PULSAR MAGNETOSPHERE
Publisher: American Astronomical Society
Date: 22-08-2016
ERRATUM: “A SHAPIRO DELAY DETECTION IN THE BINARY SYSTEM HOSTING THE MILLISECOND PULSAR PSR J1910–5959A” (2012, ApJ, 760, 100)
Publisher: American Astronomical Society
Date: 08-01-2013
Intrinsic instrumental polarization and high-precision pulsar timing
Publisher: Oxford University Press (OUP)
Date: 25-08-2015
The first interferometric detections of fast radio bursts
Publisher: Oxford University Press (OUP)
Date: 16-03-2017
DOI: 10.1093/MNRAS/STX638
The Swinburne intermediate-latitude pulsar survey
Publisher: Oxford University Press (OUP)
Date: 09-2001
Erratum: The Statistics of Radio Astronomical Polarimetry: Bright Sources and High Time Resolution (2009, ApJ, 694, 1413)
Publisher: American Astronomical Society
Date: 23-07-2010
Gravitational-Wave Cosmology across 29 Decades in Frequency
Publisher: American Physical Society (APS)
Date: 31-03-2016
Discovery and timing of the first 8gr8 Cygnus survey pulsars
Publisher: EDP Sciences
Date: 24-02-2009
Transformation of a star into a planet in a millisecond pulsar binary
Publisher: American Association for the Advancement of Science (AAAS)
Date: 23-09-2011
Abstract: Timing observations of a millisecond pulsar reveal a planet that is far denser than any known planet.
A test of general relativity from the three-dimensional orbital geometry of a binary pulsar
Publisher: Springer Science and Business Media LLC
Date: 07-2001
DOI: 10.1038/35084015
RADIO DETECTION OF LAT PSRs J1741-2054 AND J2032+4127: NO LONGER JUST GAMMA-RAY PULSARS
Publisher: American Astronomical Society
Date: 07-10-2009
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