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Sub-second periodicity in a fast radio burst

Title	Sub-second periodicity in a fast radio burst
Authors	The CHIME/FRB Collaboration , Bridget C. Andersen , Kevin Bandura , Mohit Bhardwaj , P. J. Boyle , Charanjot Brar , Daniela Breitman , Tomas Cassanelli , Shami Chatterjee , Pragya Chawla , Jean-François Cliche , Davor Cubranic , Alice P. Curtin , Meiling
Magazine	ArXiV
Date	07/18/2021
Introduction	Fast radio bursts (FRBs), brief millisecond-duration radio flashes originating billions of light-years away, present a significant puzzle in astrophysics. This study presents the observation of the multi-component FRB 20191221A using the Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst Project (CHIME/FRB). A notable finding is a periodic separation of 216.8(1) ms among its components, observed with high statistical significance. With an extended duration of approximately 3 seconds and a pulse profile comprising at least nine components, this source stands out within the known FRB population. Additionally, two other FRBs, 20210206A and 20210213A, exhibited multi-component pulse profiles with indications of periodic separations of 2.8(1) and 10.7(1) ms, respectively. These observations suggest the potential existence of a class of FRBs characterised by intricate and periodic pulse structures. Such brief periodicities offer compelling support for a neutron-star origin for these phenomena. Furthermore, the observed emissions are consistent with their generation within the neutron-star magnetosphere, rather than more distant regions, aligning with certain theoretical models. Potential mechanisms explaining the periodicity include super-giant pulses from a neutron star, potentially linked to a magnetar outburst, or the interaction of neutron stars within a binary system.
Quote	The CHIME/FRB Collaboration et al., 2021, arXiv:2107.08463 [astro-ph.HE]

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