To power the X-ray plateaus of gamma-ray bursts through larger amplitude electromagnetic waves. (arXiv:2004.12808v3 [astro-ph.HE] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Du_S/0/1/0/all/0/1">Shuang Du</a>
The origin of gamma-ray burst (GRB) X-ray plateau, especially the internal
plateau, is still unclear, but it could be related to GRB’s central engine of
magnetar. It is generally believed that the spin-down power of the magnetar is
injected into forward external shock, however we propose here that most of the
power will be dissipated behind the GRB jet through larger amplitude
electromagnetic wave (LAEMW). Based on this proposal, the relevant physical
conditions and observational implications are analyzed and discussed, and
various kinds of X-ray light curves could be reproduced. Although it is still a
matter of debate about the chromatic multi-band afterglow in the standard
external afterglow fireball model, we can explain naturally this feature under
this proposal, i.e., the electrons generating the X-ray plateau and emitting
the optical afterglow are accelerated by different mechanisms. %Furthermore, we
predict that the X-ray emission of spin-down wind could possibly precede the
prompt emission of GRB jet if the energy of LAEMW is dissipated first but
shock-induced radiation in the jet is produced later. It is emphasized that
both the GRB jet and the spin-down wind should have significant observational
consequences in the magnetar scenario, and should be focused equally in GRB
physics.
The origin of gamma-ray burst (GRB) X-ray plateau, especially the internal
plateau, is still unclear, but it could be related to GRB’s central engine of
magnetar. It is generally believed that the spin-down power of the magnetar is
injected into forward external shock, however we propose here that most of the
power will be dissipated behind the GRB jet through larger amplitude
electromagnetic wave (LAEMW). Based on this proposal, the relevant physical
conditions and observational implications are analyzed and discussed, and
various kinds of X-ray light curves could be reproduced. Although it is still a
matter of debate about the chromatic multi-band afterglow in the standard
external afterglow fireball model, we can explain naturally this feature under
this proposal, i.e., the electrons generating the X-ray plateau and emitting
the optical afterglow are accelerated by different mechanisms. %Furthermore, we
predict that the X-ray emission of spin-down wind could possibly precede the
prompt emission of GRB jet if the energy of LAEMW is dissipated first but
shock-induced radiation in the jet is produced later. It is emphasized that
both the GRB jet and the spin-down wind should have significant observational
consequences in the magnetar scenario, and should be focused equally in GRB
physics.
http://arxiv.org/icons/sfx.gif
