M
Mawson W. Sammons
Researcher at Curtin University
Publications - 10
Citations - 411
Mawson W. Sammons is an academic researcher from Curtin University. The author has contributed to research in topics: Dark matter & Fast radio burst. The author has an hindex of 4, co-authored 6 publications receiving 301 citations.
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Journal ArticleDOI
The dispersion–brightness relation for fast radio bursts from a wide-field survey
Ryan Shannon,Jean-Pierre Macquart,Jean-Pierre Macquart,Keith W. Bannister,Ron Ekers,Ron Ekers,C. W. James,C. W. James,Stefan Oslowski,Hao Qiu,Hao Qiu,Mawson W. Sammons,Aidan Hotan,Maxim Voronkov,Ron Beresford,A. Brown,John D. Bunton,Aaron Chippendale,C. Haskins,M. Leach,M. Marquarding,David McConnell,M. A. Pilawa,Elaine M. Sadler,E. R. Troup,J. Tuthill,Matthew Whiting,James R. Allison,C. S. Anderson,Martin Bell,Martin Bell,Martin Bell,Jordan D. Collier,Jordan D. Collier,G. Gürkan,George Heald,C. J. Riseley +36 more
TL;DR: A large-scale survey of fast radio bursts—short pulses of radio waves that seem to come from cosmological distances—finds 20 events, including both the nearest and the most energetic bursts observed so far, and demonstrates that there is a relationship between burst dispersion and brightness.
Journal ArticleDOI
Spectropolarimetric Analysis of FRB 181112 at Microsecond Resolution: Implications for Fast Radio Burst Emission Mechanism
Hyerin Cho,Jean-Pierre Macquart,Ryan Shannon,Adam T. Deller,I. S. Morrison,Ron Ekers,Ron Ekers,Keith W. Bannister,Wael Farah,Hao Qiu,Hao Qiu,Mawson W. Sammons,Matthew Bailes,Shivani Bhandari,Cherie K. Day,Cherie K. Day,C. W. James,Chris Phillips,J. Xavier Prochaska,J. Xavier Prochaska,J. Tuthill +20 more
Abstract: We have developed a new coherent dedispersion mode to study the emission of Fast Radio Bursts that trigger the voltage capture capability of the Australian SKA Pathfinder (ASKAP) interferometer. In principle the mode can probe emission timescales down to 3 ns with full polarimetric information preserved. Enabled by the new capability, here we present a spectropolarimetric analysis of FRB 181112 detected by ASKAP, localized to a galaxy at redshift 0.47. At microsecond time resolution the burst is resolved into four narrow pulses with a rise time of just $15 \mu$s for the brightest. The pulses have a diversity of morphology, but do not show evidence for temporal broadening by turbulent plasma along the line of sight, nor is there any evidence for periodicity in their arrival times. The pulses are highly polarized (up to 95%), with the polarization position angle varying both between and within pulses. The pulses have apparent rotation measures that vary by $15\pm 2\, {\rm rad \,m^{-2}}$ and apparent dispersion measures that vary by $0.041\pm 0.004\,{\rm pc\,cm^{-3}}$. Conversion between linear and circular polarization is observed across the brightest pulse. We conclude that the FRB 181112 pulses are most consistent with being a direct manifestation of the emission process or the result of propagation through a relativistic plasma close to the source. This demonstrates that our method, which facilitates high-time-resolution polarimetric observations of FRBs, can be used to study not only burst emission processes, but also a diversity of propagation effects present on the gigaparsec paths they traverse.
Journal ArticleDOI
First Constraints on Compact Dark Matter from Fast Radio Burst Microstructure
Mawson W. Sammons,Jean-Pierre Macquart,Ronald D. Ekers,Ryan Shannon,Hyerin Cho,J. Xavier Prochaska,Adam T. Deller,Cherie K. Day +7 more
TL;DR: In this paper, the authors investigated the implications of lensing of FRBs for the detectability of compact dark matter by FRBs and found that a sample size of ∼130 FRBs would be required to constrain compact dark mass to less than the existing 35% detection probability with 95% confidence.
Journal ArticleDOI
The fast radio burst dispersion measure distribution
TL;DR: In this article, the dispersion measure (DM) statistics of FRBs detected by the ASKAP and Parkes radio telescopes were compared, exploiting the fact that the telescopes have different survey fluence limits but likely sample the same underlying population.
Journal ArticleDOI
First Constraints on Compact Dark Matter from Fast Radio Burst Microstructure
Mawson W. Sammons,Jean-Pierre Macquart,Ronald D. Ekers,Ryan Shannon,Hyerin Cho,J. Xavier Prochaska,Adam T. Deller,Cherie K. Day +7 more
TL;DR: In this paper, the authors investigated the implications of lensing of FRBs for the detectability of compact dark matter by FRBs and found that a sample size of ∼130 FRBs would be required to constrain compact dark mass to less than the existing 35% detection probability with 95% confidence.