Uhm 2007 仅用外激波的反向激波解释余辉

主要内容:
企图认为正向激波不存在，只用反向激波解释余辉包括X射线的平降过程。

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文章信息:

astro-ph/0701205 [abs, ps, pdf, other] :

Title: On the Mechanism of Gamma-Ray Burst Afterglows
Authors: Z. Lucas Uhm, Andrei M. Beloborodov (Columbia University)
Comments: 10 pages, submitted to ApJ Letters

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 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 (Beloborodov, Uhm 2006); we use it in our calculations.