Astro Seminar - "A Unified Understanding of Fast Radio Bursts"

Wenbin Lu (Caltech)

Sep 29, 2020 3:30 PM
Astro Seminar

Title: A Unified Understanding of Fast Radio Bursts

Abstract:

Discovering fast radio bursts (FRBs) and measuring their physical properties have become the leading scientific goals of many current and future telescopes. This effort has led to a rapidly growing sample of FRBs with extremely diverse characters, in luminosity (10^38 to 10^45 erg/s), frequency (300 MHz to 8 GHz), duration (0.1 ms to 10 ms), polarization (from weakly polarized to 100% linear), repeating rate (many per hour to so-far non-repeaters), and distances (10 kpc to many Gpc). We study the cosmological volumetric rate density and provide evidence that these bursts all belong to the same class of transients --- most likely all repeaters. We suggest that magnetic disturbances close to the surface of a magnetar propagate to a distance of a few tens of neutron star radii where they damp and produce coherent radio emission. The coincident hard X-ray emission associated with the two pulses seen in FRB 200428 as well as the radio to X-ray flux ratio can be understood in this scenario. This model provides a unified picture for faint Galactic FRBs as well as the bright events seen at cosmological distances. If time allows, the polarization properties will also be addressed.


More about Wenbin Lu ⇒


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Astro Seminar - "A Unified Understanding of Fast Radio Bursts"

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