FRB 190520B -- A FRB in a Supernova Remnant?
J. I. Katz

TL;DR
This paper discusses FRB 190520B, a repeating fast radio burst with a large, variable dispersion measure excess likely caused by a young supernova remnant, and proposes using baseband data to measure high rotation measures.
Contribution
It introduces the idea that the dispersion measure excess in FRB 190520B is due to a young supernova remnant and suggests a method to measure large rotation measures using baseband data.
Findings
Dispersion measure excess varies on a 30-year timescale.
The excess is likely due to a supernova remnant a few decades old.
Magnetic field in the remnant could be around 1 Gauss.
Abstract
FRB 190520B, a repeating FRB near-twin of FRB 121102, was discovered \citep{N21} to have a dispersion measure excess over the intergalactic and Galactic contributions of about 900 pc-cm, attributable to its host galaxy or near-source environment. This excess varies on a time scale of y and might be explained by a supernova remnant no more than a few decades old. A magnetic field in equipartition with the remnant's expansion would be . I suggest the use of baseband data to measure very large rotation measures.
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Taxonomy
TopicsPulsars and Gravitational Waves Research · Gamma-ray bursts and supernovae · Astrophysics and Cosmic Phenomena
