Fast Radio Burst Breakouts from Magnetar Burst Fireballs
Kunihito Ioka

TL;DR
This paper proposes that magnetar X-ray bursts create an electron-positron outflow that can suppress or allow the escape of associated fast radio bursts, providing insights into their emission mechanisms and observational signatures.
Contribution
It introduces a model where high-temperature X-ray bursts produce an electron-positron outflow that influences FRB breakout, linking magnetar activity to FRB observability.
Findings
FRBs can break out if emitted beyond a few tens of NS radii.
FRB strength and X-ray burst intensity determine if the FRB is choked.
High-temperature X-ray bursts are likely essential for FRB occurrence.
Abstract
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 keV entail an electron--positron () outflow from a trapped--expanding fireball, polluting the NS magnetosphere before the FRB emission. The outflow is opaque to FRB photons, and is strongly Compton-dragged by the X-ray bursts. Nevertheless, the FRB photons can break out of the 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…
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