Lazzati 2008 X-ray flares中心引擎晚期能量注入

主要内容:
发现flares的能量随时间是呈幂律下降的。

精彩摘抄:
In this paper we show that the energy emitted in the form of flares decreases with time as a power-law


文章信息:

· arXiv e-print (arXiv:0804.2895)

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Title:		X-ray flares and their relation to the inner engine activity of GRBs
Authors:		Lazzati, Davide; Morsony, Brian J.; Perna, Rosalba; Begelman, Mitchell C.
Publication:		eprint arXiv:0804.2895
Publication Date:		04/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		Solicited paper to appear in Proceedings of Gamma Ray Bursts 2007 Meeting, Santa Fe, New Mexico
Bibliographic Code:		2008arXiv0804.2895L

Abstract

Flares overlaid on the smooth power-law decay of Swift X-ray afterglows are rather common, appearing in roughly half the observed light curves. They are a manifestation of the late time activity of the inner engine, since their temporal evolution is too fast to be linked to activity taking place in the external shock blastwave. In this paper we show that the energy emitted in the form of flares decreases with time as a power-law. We discuss several possibilities in which the flares can be powered and the source of the observed variability. We show that late time accretion from a disk can provide the necessary energy input in both classes of short duration and long duration gamma-ray bursts.

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