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文献详情 >FRB 20230708A, a quasi-periodi... 收藏

FRB 20230708A, a quasi-periodic FRB with unique temporal-polarimetric morphology

作     者:Dial, T. Deller, A. T. Uttarkar, P. A. Lower, M. E. Shannon, R. M. Gourdji, Kelly Marnoch, Lachlan Bera, A. Ryder, Stuart D. Glowacki, Marcin Prochaska, J. Xavier 

作者机构:Swinburne Univ Technol Ctr Astrophys & Supercomp POB 218 Hawthorn Vic 3122 Australia ARC Ctr Excellence All Sky Astrophys 3 Dimens ASTR Stromlo Australia Macquarie Univ Sch Math & Phys Sci Sydney NSW 2109 Australia Macquarie Univ Astrophys & Space Technol Res Ctr Sydney NSW 2109 Australia Curtin Univ Int Ctr Radio Astron Res Bentley WA 6102 Australia CSIRO Space & Astron Australia Telescope Natl Facil Box 76 Epping NSW 1710 Australia Univ Calif Santa Cruz Dept Astron & Astrophys Santa Cruz CA 95064 USA Kavli Inst Phys & Math Universe 5-1-5 Kashiwanoha Kashiwa 2778583 Japan Natl Astron Observ Japan Div Sci 2-21-1 Osawa Mitaka Tokyo 1818588 Japan 

出 版 物:《MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY》 (Mon. Not. R. Astron. Soc.)

年 卷 期:2025年第536卷第4期

页      面:3220-3231页

核心收录:

学科分类:07[理学] 0704[理学-天文学] 

基  金:ARC Australian Government National Collaborative Research Infrastructure Strategy Government of Western Australia Science and Industry Endowment Fund [108.21ZF] ESO programme [FT19010155, DP220102305] ARC Future Fellowship [DP210102103] Australian Government through the Australian Research Council Discovery Project [IES\R1\231332] Royal Society 

主  题:methods: data analysis stars: neutron radio continuum: transients fast radio bursts 

摘      要:There has been a rapid increase in the known fast radio burst (FRB) population, yet the progenitor(s) of these events have remained an enigma. A small number of FRBs have displayed some level of quasi-periodicity in their burst profile, which can be used to constrain their plausible progenitors. However, these studies suffer from the lack of polarization data which can greatly assist in constraining possible FRB progenitors and environments. Here, we report on the detection and characterisation of FRB 20230708A by the Australian Square Kilometre Array Pathfinder (ASKAP), a burst which displays a rich temporal and polarimetric morphology. We model the burst time series to test for the presence of periodicity, scattering and scintillation. We find a potential period of T = 7.267 ms within the burst, but with a low statistical significance of 1.77 sigma. Additionally, we model the burst s time- and frequency-dependent polarization to search for the presence of (relativistic and non-relativistic) propagation effects. We find no evidence to suggest that the high circular polarization seen in FRB 20230708A is generated by Faraday conversion. The majority of the properties of FRB 20230708A are broadly consistent with a (non-millisecond) magnetar model in which the quasi-periodic morphology results from microstructure in the beamed emission, but other explanations are not excluded.

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