The confrontation of the shock-powered synchrotron maser model with the Galactic FRB 200428

TL;DR

This paper evaluates the shock-powered synchrotron maser model's ability to explain the Galactic FRB 200428, considering specific ejecta structures and shock conditions, and finds it potentially consistent with observations under certain parameters.

Contribution

It provides a detailed analysis of the shock-powered synchrotron maser model's compatibility with FRB 200428, highlighting necessary ejecta configurations and parameter constraints.

Findings

Model can be consistent with observations if ejecta have specific structures.

Ejecta should include ultra-relativistic $e^{eta}$ components and sub-relativistic baryonic components.

Emission efficiency estimated around 10^{-4} with spectral index of -2.

Abstract

The association of FRB 200428 with an X-ray burst (XRB) from the Galactic magnetar SGR 1935+2154 offers important implications for the physical processes responsible for the fast radio burst (FRB) phenomena. By assuming that the XRB emission is produced in the magnetosphere, we investigate the possibility that the FRB emission is produced by shock-powered synchrotron maser (SM), which is phenomenologically described with a plenty of free parameters. The observational constraints on the model parameters indicate that the model can in principle be consistent with the FRB 200428 observations, if the ejecta lunched by magnetar activities can have appropriate ingredients and structures and the shock processes occur on the line of sight. To be specific, a complete burst ejecta should consist of an ultra-relativistic and extremely highly collimated $e^{\pm}$ component and a sub-relativistic and wide-spreading baryonic component. The internal shocks producing the FRB emission arise from a collision between the $e^{\pm}$ ejecta and the remnant of a previous baryonic ejecta at the same direction. The parameter constraints are still dependent on the uncertain spectrum and efficiency of the SM emission. While the spectrum is tentatively described by a spectral index of $-2$, we estimate the emission efficiency to be around $10^{-4}$ by requiring that the synchrotron emission of the shocked material cannot be much brighter than the magnetosphere XRB emission.