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Article
Astronomy & Astrophysics
M. T. Miles et al.
Summary: We present the first 2.5 yr of data from the MeerKAT Pulsar Timing Array (MPTA), aiming to measure pulse arrival times from 88 pulsars with the goal of contributing to the study of gravitational waves. The data release includes arrival times, noise models, and timing archives for 78 pulsars with high precision. The study also introduces a novel method for clock correction waveform recovery solely from pulsar timing residuals.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Ziyang Wang et al.
Summary: We measured the average flux density of 151 radio pulsars at 1.4 GHz using the Parkes 'Murriyang' radio telescope. Our results should be included in the next version of the Australia Telescope National Facility Pulsar Catalogue. The large sample and wide dispersion measure range of the pulsars allow for studying flux density variability, pulsar spectra, and interstellar medium properties. We derived modulation indices and structure functions for a subset of pulsars and suggest including the modulation index in the pulsar catalogue to demonstrate flux density variability. The modulation index is negatively correlated with dispersion measure.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Kaitlyn Shin et al.
Summary: Fast radio bursts (FRBs) are brief, energetic, typically extragalactic flashes of radio emission whose progenitors are largely unknown. We used a catalog of 536 FRBs from the CHIME/FRB collaboration to study the FRB population and calibrate for selection effects. Our results provide insights into the energy distribution, density, and redshift distribution of FRBs, and can help constrain models for FRB progenitors. The upcoming CHIME/FRB Outriggers project will further validate our findings by providing localizations and redshifts of FRBs.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
J. Askew et al.
Summary: Long-term studies of binary millisecond pulsars (MSPs) provide precise tests of strong-field gravity and measure neutron-star masses. The scintillation of PSR J1909-3744 was studied using observations from the 64-m Parkes Radio Telescope over a 13-year period. The statistics of the ionized interstellar medium (IISM) remained constant, and a slightly anisotropic model was preferred.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Rowina S. Nathan et al.
Summary: Precision pulsar timing is crucial for detecting nanohertz stochastic gravitational-wave background and understanding neutron star physics. The conventional method of fixed-time and frequency-averaged templates can lead to reduced accuracy due to the evolution of pulse shape over time. We propose a dynamic timing method that fits each observing epoch separately using basis functions, allowing for pulse shape evolution. Applying this method to PSR J1103-5403, we find evidence of mode changing and improve the timing solution by 1.78 times compared to template fitting. The reduction in white noise boosts the signal-to-noise ratio of gravitational-wave background signal by 32 percent for this pulsar.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Gabriella Agazie et al.
Summary: This article presents observations and timing analyses of 68 millisecond pulsars from the 15 year data set of the NANOGrav experiment. The study shows evidence for a stochastic gravitational wave background and improves the overall quality of the data set by adding new pulsars and extending the timing baselines. It also provides a full suite of software for reproducing data reduction, analysis, and results.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
M. T. Miles et al.
Summary: This study presents baseband radio observations of the millisecond pulsar J1909-3744 using the MeerKAT telescope, revealing strong evidence of pulse mode changing and an improvement in timing precision. The impact of this improvement on gravitational wave background searches is discussed.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
C. W. James et al.
Summary: We have developed a sophisticated model to investigate fast radio bursts (FRBs), considering various factors such as cosmological gas distribution, host galaxy contributions, and observational biases. Our analysis provides the most detailed account of observational biases and significantly improves the accuracy and precision of FRB observations. Based on the data from ASKAP and Parkes, we present the best-fitting FRB population parameters and discuss the expected and fitted distributions in redshift, dispersion measure, and signal to noise. Our results suggest that the highest-dispersion measure events detected in the unlocalized Parkes and ASKAP samples are unlikely to be the most distant. This study highlights the importance of localized FRBs for understanding the DM-z relation and points out the limitations in our analysis, such as uncertainties in FRB spectral behavior and sensitivity response of search experiments, as well as the treatment of the repeating population and luminosity function.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Review
Multidisciplinary Sciences
Matthew Bailes
Summary: FRB is a type of coherent radio emission bursts that lasts for milliseconds and is luminous enough to be detected at cosmological distances. Thousands of potentially observable FRBs reach Earth every day, likely originating from highly magnetic and/or rapidly rotating neutron stars in the distant universe. Some FRBs repeat and exhibit cyclic activity windows, and the host galaxies of some FRBs have been localized, providing information about the host environments and the total baryonic content of the Universe.
Article
Astronomy & Astrophysics
R. Spiewak et al.
Summary: MeerTime is a five-year survey project that aims to time pulsars with MeerKAT. Through an initial census of 189 pulsars visible to MeerKAT, we have obtained various parameters that provide important resources for population studies. Currently, MeerTime has made significant achievements and is of great significance for global efforts to detect the gravitational wave background.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
(2022)
Article
Astronomy & Astrophysics
A. Josephy et al.
Summary: The study found no dependence of the sky rate of fast radio bursts (FRBs) on Galactic latitude, supporting that FRBs originate from an isotropic population of extragalactic sources.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
A. Parthasarathy et al.
Summary: This study investigated the jitter phenomenon of millisecond pulsars using the MeerKAT radio telescope, revealing significant variations in jitter levels among different pulsars and highlighting the impact of jitter on measuring dispersion measure (DM). The research suggests that all millisecond pulsars have their own limit on DM precision, which can only be overcome with longer integrations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
H. Kumamoto et al.
Summary: The Parkes telescope has been monitoring 286 radio pulsars monthly since 2007 at 1.4 GHz. The data is valuable for studying flux density variability and the interstellar medium. Modulation index is inversely correlated with DM, showcasing the complex nature of the ISM along individual lines of sight.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
M. Kramer et al.
Summary: The Relativistic Binary programme (RelBin) is part of the MeerTime large survey project with the MeerKAT radio telescope, focused on observations of binary pulsars to measure neutron star masses and test gravity theories. They selected 25 pulsars as initial targets based on their characteristics and observational history, gathering polarization calibrated pulse profiles and Faraday rotation measures. Timing observations with MeerKAT have significantly improved existing data sets, demonstrating better results by a factor of typically 2-3, and sometimes by an order of magnitude.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Physics, Multidisciplinary
M. Kramer et al.
Summary: Continued timing observations of the double pulsar PSR J0737-3039A/B have led to significant improvements in measuring relativistic effects, with new effects observed for the first time. The precision tests of gravity theories and validation of general relativity's predictions have been achieved at a level of 1.3 x 10(-4) with 95% confidence, demonstrating the utility of the double pulsar for alternative theories of gravity tests. The implications of the findings for neutron stars, gravitational waves, interstellar medium, and formation models of double pulsar systems have also been discussed.
Article
Astronomy & Astrophysics
C. Sobey et al.
Summary: In this study, high signal-to-noise ratio, full polarization pulse profiles for 40 bright, 'slowly' rotating pulsars were presented using the new ultrawideband low-frequency receiver on the Parkes radio telescope. The results revealed trends in the pulse profiles and provided valuable insights into pulsar emission and the intervening interstellar medium. The calibrated data products are publicly available for further research and analysis.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
M. Geyer et al.
Summary: The study observed the phenomenon of giant radio pulses in PSR J0540-6919, which have strong linear polarization, but significant variability in polarization fraction between pulses, and their overall flux distribution follows a power-law distribution. The research also found that these pulses are affected by scattering at L-band frequencies, with some pulses showing flux structures similar to those seen in Fast Radio Bursts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
H. Kumamoto et al.
Summary: The Parkes telescope has been monitoring 286 radio pulsars approximately monthly since 2007 at an observing frequency of 1.4 GHz. The modulation index is inversely correlated with DM, and the study of the interstellar medium is important due to the complex nature of its effects on pulsar flux density variations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Daniel J. Reardon et al.
ASTROPHYSICAL JOURNAL
(2020)
Article
Astronomy & Astrophysics
M. Bailes et al.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
(2020)
Article
Astronomy & Astrophysics
V. Morello et al.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2019)
Article
Astronomy & Astrophysics
F. Jankowski et al.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Astronomy & Astrophysics
Pawan Kumar et al.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2017)
Article
Astronomy & Astrophysics
Mengyao Xue et al.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
(2017)
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Astronomy & Astrophysics
S. Dai et al.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2015)
Article
Astronomy & Astrophysics
Jean-Pierre Macquart et al.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2015)
Article
Astronomy & Astrophysics
E. Petroff et al.
ASTROPHYSICAL JOURNAL LETTERS
(2014)
Article
Astronomy & Astrophysics
R. M. Shannon et al.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2014)
Article
Astronomy & Astrophysics
J. Boyles et al.
ASTROPHYSICAL JOURNAL
(2013)
Article
Astronomy & Astrophysics
Xavier Siemens et al.
CLASSICAL AND QUANTUM GRAVITY
(2013)
Article
Astronomy & Astrophysics
L. Levin et al.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2013)
Article
Multidisciplinary Sciences
D. Thornton et al.
Article
Astronomy & Astrophysics
S. Oslowski et al.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2011)
Article
Astronomy & Astrophysics
R. Smits et al.
ASTRONOMY & ASTROPHYSICS
(2009)
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Astronomy & Astrophysics
X. P. You et al.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2007)
Article
Multidisciplinary Sciences
M Kramer et al.
Article
Astronomy & Astrophysics
RN Manchester et al.
ASTRONOMICAL JOURNAL
(2005)
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Astronomy & Astrophysics
SM Ord et al.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2004)
Article
Astronomy & Astrophysics
M Haverkorn et al.
ASTROPHYSICAL JOURNAL
(2004)
Article
Astronomy & Astrophysics
RN Manchester et al.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2001)
Article
Astronomy & Astrophysics
B Rickett
ASTROPHYSICS AND SPACE SCIENCE
(2001)
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Astronomy & Astrophysics
DR Stinebring et al.
ASTROPHYSICAL JOURNAL
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