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arXiv 0912.1887astro-ph.CO
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费米伽玛暴高能辐射的解释

Interpreting the high energy emission of Fermi GRBs

Yi-Zhong Fan

摘要:

伽马射线暴的高能辐射具有一些有趣的特征,包括在瞬发谱中没有GeV过量,GeV辐射的延迟开始,以及GeV辐射的持续时间比瞬发软伽玛射线辐射长。我们认为,在大多数GRB光谱中未检测到GeV过量可能有利于磁火球模型,早期的瞬发辐射可能主要由爆发物质的光球辐射,因此非常软。GeV波段的同步辐射可能是高能余辉发射的主要成分,这在GRB 080319 B中得到了推测,然后在GRB 080916 C和GRB 090510中得到了证实。一个简单的估计的热辐射的突破材料已经提出。

英文摘要:

The high energy emission from Gamma-ray Bursts has some interesting features, including the absence of the GeV excess in the prompt spectrum, the delayed onset of the GeV emission, and the longer duration of the GeV emission than the prompt soft gamma-ray emission. We suggest that the non-detection of a GeV excess in most GRB spectrum may favor the magnetic fireball model and the early prompt emission may be dominated by the photosphere radiation of the breakout material and is thus very soft. The synchrotron radiation in GeV band can be the dominant component of the high energy afterglow emission, as speculated in GRB 080319B and then confirmed in GRB 080916C and GRB 090510. A simple estimate of the thermal radiation of the breakout material has been presented.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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