Bromberg, Omer 2011 伽马暴坍缩星模型的一个证据

主要内容:
下图的平台是证据。考虑到喷流冲出包层需要时间，只有冲出后的时间才被当做T90.这就相当于X射线shellow decay的时间零点移动模型一样。那么在时间短的那些暴满足的power law的分布应该是(T90+tau)^-alpha，换成T90^-beta就有一个平台。
更短的地方的突起就不应该是坍缩星的，而是另一类，短暴。


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Title:		An observational imprint of the Collapsar model of long Gamma Ray Bursts
Authors:		Bromberg, Omer; Nakar, Ehud; Piran, Tsvi; Sari, Re'em
Publication:		eprint arXiv:1111.2990
Publication Date:		11/2011
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		12 pages, 1 figure
Bibliographic Code:		2011arXiv1111.2990B

Abstract

The Collapsar model provides a theoretical framework for the well known association between long gamma-ray bursts (GRBs) and collapsing massive stars. A bipolar relativistic jet, launched at the core of a collapsing star, drills its way through the stellar envelope and breaks out of the surface before producing the observed gamma-rays. While a wealth of observations associate GRBs with the death of massive stars, as yet there is no direct evidence for the Collapsar model itself. Here we show that a distinct signature of the Collapsar model is the appearance of a plateau in the duration distribution of the prompt GRB emission at times much shorter than the typical breakout time of the jet. This plateau is evident in the data of all three major satellites. These findings provide an evidence that directly supports the Collapsar model. Additionally, it suggests the existence of a large population of choked (failed) GRBs and that the 2 s duration commonly used to separate Collapsars and non-Collapasars is inconsistent with the duration distributions of {\it Swift} and Fermi GRBs and only holds for BATSE GRBs.

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