Lemoine 2011 磁化星风的费米加速

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Title:		Gamma-ray bursts afterglows in magnetized stellar winds
Authors:		Lemoine, Martin; Pelletier, Guy
Publication:		eprint arXiv:1103.4823
Publication Date:		03/2011
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		5 pages, 3 figures
Bibliographic Code:		2011arXiv1103.4823L

Abstract

Recent analytical and numerical work have converged to argue that the successful development of relativistic Fermi acceleration requires a weak magnetization of the unshocked plasma, all the more so at high Lorentz factors. The present paper proposes to test this conclusion by computing the afterglow of a gamma-ray burst outflow propagating in a magnetized stellar wind using "ab initio" principles regarding the microphysics of relativistic Fermi acceleration. It is shown that in such magnetized environments, one expects a drop-out in the X-ray band on sub-day scales due to the concomitant inhibition of Fermi acceleration and redshifting of the synchrotron emission of shock heated electrons. At later times, Fermi acceleration becomes operative when the blast Lorentz factor drops below a certain critical value, leading to the recovery of the standard afterglow light curve. Interestingly, the observed drop-out bears resemblance with the fast decay found in gamma-ray bursts early X-ray afterglows.

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