Giannios 2008 恒星光子作为种子光子的高能辐射

主要内容:
让恒星的光子作为背景光子， 激波电子对这些光子进行逆康普顿散射，得到高能辐射。

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文章信息:

· arXiv e-print (arXiv:0805.0258)

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Title:		Powerful GeV emission from a gamma-ray-burst shock wave scattering stellar photons
Authors:		Giannios, Dimitrios
Publication:		eprint arXiv:0805.0258
Publication Date:		05/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		4 pages, 3 figures, submitted to A&A Letters
Bibliographic Code:		2008arXiv0805.0258G

Abstract

The gamma-ray bursts of long duration are likely connected to the death of massive stars. The gamma-ray emission is believed to come from energy released internally in a flow that moves at ultrarelativistic speed. The fast flow drives a shock wave into the external medium leading to the afterglow emission. Most massive stars form in dense clusters, their high luminosity producing a very dense radiation field. Here, I explore the observational consequences of the interaction of the shocked external medium of the burst with the photon field of a nearby O star. I show that inverse Compton scattering of the stellar photons by electrons heated by the shock leads to powerful gamma-ray emission in the ~1-100 GeV range. This emission appears minutes to hours after the burst and can be easily detected by Cherenkov telescopes and likely with the GLAST satellite. This signal may have already been observed in GRB 940217 and can yield important information about the circumburst environment.

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