Multi-wavelength afterglow emission from bursts associated with magnetar flares and fast radio bursts

TL;DR

This paper models and analyzes the multi-wavelength afterglow emissions from magnetar-related bursts, exploring their detectability and implications for understanding their origins.

Contribution

It provides analytical and numerical calculations of afterglow spectra and light curves for bursts in magnetar environments, expanding on the burst-in-bubble model.

Findings

Detectability of radio afterglows with next-generation telescopes.

Parameter space analysis for burst detectability.

Estimated number of observable afterglow events.

Abstract

Magnetars have been considered as progenitors of magnetar giant flares (MGFs) and fast radio bursts (FRBs). We present detailed studies on afterglow emissions caused by bursts that occur in their wind nebulae and surrounding baryonic ejecta. In particular, following the bursts-in-bubble model proposed by Murase, Kashiyama \& M\'esz\'aros, we analytically and numerically calculate spectra and light curves of such afterglow emission. We scan parameter space for the detectability of radio signals, and find that a burst with $\sim10^{45}~{\rm erg}$ is detectable with the Very Large Array or other next-generation radio facilities. The detection of multi-wavelength afterglow emission from MGFs and/or FRBs is of great significance for their localization and revealing their progenitors, and we estimate the number of detectable afterglow events.