2020/10/31 by Di Xiao, Zi-Gao Dai
Physics and Astronomy · #Astrophysical Phenomena and Observations #Electron #Gamma-ray bursts and supernovae #Jump #Luminosity #Magnetar #Maser #Pulsars and Gravitational Waves Research #Pulse (music) #Synchrotron #Synchrotron radiation #astro-ph.HE
paper · pdf · doi:10.3847/2041-8213/abc551
published as 2020, ApJL, 904, L5 · 6 pages, 2 figures
openalex publication_date 2020/11/01 · openalex created_date 2020/11/09 · arxiv created 2020/11/23 · arxiv updated 2020/11/24 · openalex updated_date 2026/08/05
Abstract Very recently a fast radio burst (FRB) 200428 associated with a strong X-ray burst from the Galactic magnetar SGR 1935+2154 was detected; this provides direct evidence supporting the magnetar progenitor models of FRBs. Assuming that the FRB radiation mechanism is synchrotron maser emission from magnetized shocks, we develop a specific scenario by introducing a density-jump structure of upstream medium, thus making the double-peaked character of FRB 200428 a natural outcome. The luminosity and emission frequency of two pulses can be well explained in this scenario. Furthermore, we find that the synchrotron emission of shock-accelerated electrons is in the X-ray band, and therefore can be responsible for at least a portion of observed X-ray fluence. With the proper upgrade, in the future this density-jump scenario could be applied to FRBs with multiple peaks.