Fast Radio Bursts from reconnection events in magnetar magnetospheres

TL;DR

This paper links Fast Radio Bursts to magnetar magnetospheres, showing that reconnection events can produce coherent radio emissions consistent with observed FRBs, confirmed by a recent detection from SGR 1935+2154.

Contribution

It demonstrates that FRBs originate from reconnection events in magnetar magnetospheres, providing a physical mechanism consistent with recent observational data.

Findings

Detection of a radio burst coincident with a magnetar's high-energy burst.

Radio emission generated within 100 stellar radii of the magnetar.

Reconnection-driven plasma emission explains the observed FRB properties.

Abstract

Lyutikov (2002) predicted "radio emission from soft gamma-ray repeaters (SGRs) during their bursting activity". Detection of a Mega-Jansky radio burst in temporal coincidence with high energy bursts from a Galactic magnetar SGR 1935+2154 confirms that prediction. Similarity of this radio event with Fast Radio Bursts (FRBs) suggests that FRBs are produced within magnetar magnetospheres. We demonstrate that SGR 1935+2154 satisfies the previously derived constraints on the physical parameters at the FRBs' loci. Coherent radio emission is generated in the inner parts of the magnetosphere at $r< 100 R_{\rm NS}$. The radio emission is produced by the yet unidentified plasma emission process, occurring during the initial stages of reconnection events.