期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 904, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/2041-8213/abc6a3
关键词
Radio transient sources; Magnetars; Pulsars; X-ray bursts; Non-thermal radiation sources; Relativistic mechanics
资金
- JSPS KAKENHI [20H01901, 20H01904, 20H00158, 18H01213, 18H01215, 17H06357, 17H06362, 17H06131]
- Grants-in-Aid for Scientific Research [18H01213, 18H01215, 20H01904] Funding Source: KAKEN
The recent discovery of a Mega-Jansky radio burst occurring simultaneously with short X-ray bursts from the Galactic magnetar (strongly magnetized neutron star (NS)) SGR 1935+2154 is a smoking gun for the hypothesis that some cosmological fast radio bursts (FRBs) arise from magnetar bursts. We argue that the X-ray bursts with high temperature T greater than or similar to 30 keV entail an electron-positron (e) outflow from a trapped-expanding fireball, polluting the NS magnetosphere before the FRB emission. The e outflow is opaque to induced Compton scatterings of FRB photons, and is strongly Compton-dragged by the X-ray bursts. Nevertheless, the FRB photons can break out of the e outflow with radiation forces if the FRB emission radius is larger than a few tens of NS radii. A FRB is choked if the FRB is weaker or the X-ray bursts are stronger, possibly explaining why there are no FRBs with giant flares and no detectable X-ray bursts with weak FRBs. We also speculate that the e outflow may be inevitable for FRBs, solving the problem of why the FRBs occur only with high-T X-ray bursts. The breakout physics is important for constraining the emission mechanism and electromagnetic counterparts to future FRBs.
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