Lazzati 2010 喷流传播中的不稳定性导致X射线耀发

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喷流的动力学过程中的不稳定可以产生动能光度的起伏，而不需要中央引擎。

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Title:		X-ray flares from propagation instabilities in long Gamma-Ray Burst jets
Authors:		Lazzati, Davide; Blackwell, Chris H.; Morsony, Bran J.; Begelman, Mitch C.
Publication:		eprint arXiv:1008.4364
Publication Date:		08/2010
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		5 pages, submitted to MNRAS
Bibliographic Code:		2010arXiv1008.4364L

Abstract

We present a numerical simulation of a gamma-ray burst jet from a long-lasting engine in the core of a 16 solar mass Wolf-Rayet star. The engine is active for 6000 s with a luminosity that decays in time as a power-law with index -5/3. Even though there is no short time-scale variability in the engine luminosity, we find that the jet's kinetic luminosity outside the progenitor star is characterized by fluctuations with relatively short time scale. We analyze the temporal characteristics of those fluctuations and we find that they are consistent with the properties of observed flares in the X-ray afterglows. The peak to continuum flux ratio of the flares in the simulation is consistent with some, but not all, the observed flares. We propose that propagation instabilities, rather than variability in the engine luminosity, may be responsible for the X-ray flares with moderate contrast. Strong flares such as the one detected in GRB 050502B, instead, cannot be reproduced in this model and require strong variability in the engine activity.

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