On the mechanism of gamma-ray burst afterglows

被引：127

作者：

Uhm, Z. Lucas

Beloborodov, Andrei M.

机构：

[1] Columbia Univ, Dept Phys, New York, NY 10027 USA

[2] Columbia Univ, Columbia Astrophys Lab, New York, NY 10027 USA

[3] PN Lebedev Phys Inst, Astrospace Ctr, Moscow 117810, Russia

来源：

ASTROPHYSICAL JOURNAL | 2007年 / 665卷 / 02期

关键词：

gamma rays : bursts; hydrodynamics; radiation mechanisms : nonthermal; relativity shock; waves;

D O I：

10.1086/519837

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The standard model of afterglow production by the forward shock wave is not supported by recent observations. We propose a model in which the forward shock is invisible and afterglow is emitted by a long-lived reverse shock in the burst ejecta. It explains observed optical and X-ray light curves, including the plateau at 10(3)-10(4) s with a peculiar chromatic break, and the second break that was previously associated with a beaming angle of the explosion. The plateau forms following a temporary drop of the reverse-shock pressure much below the forward-shock pressure. A simplest formalism that can describe such blast waves is the "mechanical" model; we use it in our calculations.

引用

页码：L93 / L96

页数：4

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