FRB 190520B -- A FRB in a Supernova Remnant?

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${}^{-3}$, attributable to its host galaxy or near-source environment. This excess varies on a time scale of $\sim 30$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 $\mathcal{O}(1\text{G})$. I suggest the use of baseband data to measure very large rotation measures.

4 pp Added discussion of use of baseband data to measure very large FRB rotation measures

References in corpus (5)

• Possible periodic activity in the repeating FRB 121102
• FRB as Products of Accretion Disc Funnels
• Are Fast Radio Bursts Made By Neutron Stars?
• The Environment of FRB 121102 and Possible Relation to SGR/PSR J1745-2900
• A Polarization Pipeline for Fast Radio Bursts Detected by CHIME/FRB

Cited by in corpus (7)

• Temporal Scattering, Depolarization, and Persistent Radio Emission from Magnetized Inhomogeneous Environments Near Repeating Fast Radio Burst Sources
• Finding the missing baryons in the intergalactic medium with localized fast radio bursts
• Rotation Measure Variations and Reversals of Repeating Fast Radio Bursts in Massive Binary Systems
• An extremely active repeating fast radio burst source in a likely non-magneto-ionic environment
• Multi-year Polarimetric Monitoring of Four CHIME-Discovered Repeating Fast Radio Bursts with FAST
• Fast Radio Bursts
• Quasi-steady emission from repeating fast radio bursts can be explained by magnetar wind nebulae