Yu 2008 GRB 080319B 内激波的正反激波模型

主要内容:
伽玛射线来自相对论性的反向激波，光学辐射来自非相对论性的正向激波。

（大家都是从中心引擎出来的shell，为什么反向激波和正向激波不是等价的？）

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文章信息:

· arXiv e-print (arXiv:0806.2010)

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Title:		GRB 080319B: optical and gamma-ray emissions from internal forward-reverse shocks
Authors:		Yu, Y. W.; Wang, X. Y.; Dai, Z. G.
Publication:		eprint arXiv:0806.2010
Publication Date:		06/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		11 pages, submitted to ApJ Letters
Bibliographic Code:		2008arXiv0806.2010Y

Abstract

The temporal coincidence between the prompt $\gamma$-ray and optical emissions of gamma-ray burst (GRB) 080319B suggests that they may originate from a same emitting region or two regions sharing the same dynamical behavior. Meanwhile, the significant excess of the optical flux over the extrapolation of the $\gamma$-ray spectrum to the optical band indicates two different emission components. We here consider the popular internal shock model where a forward and a reverse shock are generated simultaneously during a collision of two relativistic shells. In the case that the Lorentz factors of these two shocks are very different, the synchrotron emission driven by them could peak at two different energy bands. We show that such a two-component synchrotron scenario can account for the prompt optical and $\gamma$-ray emissions of GRB 080319B under some unique conditions. In addition, the luminosity of an inverse-Compton sub-GeV or GeV component predicted in this scenario is not higher than that of synchrotron MeV gamma-rays, which could be tested by the {\em Gamma-ray Large Area Space Telescope} (GLAST).

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