Yu, Y. B. 2014 超长暴 111209A的能量注入模型

主要内容:
分别在不同的时间注入不能的能量，来解释余辉中的增亮。

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Title:		Fall back accretion and energy injections in the ultra-long GRB 111209A
Authors:		Yu, Y. B.; Wu, X. F.; Huang, Y. F.; Coward, D. M.; Stratta, G.; Gendre, B.; Howell, E. J.
Publication:		eprint arXiv:1312.0794
Publication Date:		12/2013
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		18 pages, 2 figures, submitted to APJ. v2: replaced, references added, Conclusions unchanged
Bibliographic Code:		2013arXiv1312.0794Y

Abstract

The ultra-long Gamma Ray Burst 111209A, which occurred at a redshift of $z = 0.677$, is the longest duration burst ever observed due to a rest frame prompt emission duration of order of $10^{4}$ s. The very early X-ray afterglow of Gamma Ray Burst 111209A showed unusual behavior, with a significant bump observed at about 2000 s after the BAT trigger. One possible explanation is that the bump resulted from mass fall back. In this paper, we present a detailed numerical study of the fall back process to interpret the very early X-ray afterglow light curve of Gamma Ray Burst 111209A. For the afterglow at late times, we apply external shock by adding an energy injection. In our model, we assume two periods of energy injection, each with a constant injection power. One injection starts at $8.0\times10^{3}$ s and lasts for about 8000 s, with an injection power of $9.0\times10^{47}$ ${\rm erg}$ ${\rm s^{-1}}$; this energy injection accounts for the plateau at X-ray wavelength in the early stage. The other injection starts at $6.5\times10^{4}$ s and lasts for about 16 ks with an injection power of $6.0\times10^{46}$ ${\rm erg}$ ${\rm s^{-1}}$. This second energy injection can help to explain the other plateau at X-ray wavelengths and the rebrightening in the optical band at about $10^{5}$ s. We argue that the two periods of energy injection can be produced by the infall of clumpy mass onto the central compact object of the burster, which leads to an enhancement of the accretion rate and results in a strong temporary outflow.

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