Genet 2007 反向激波解释早期X射线余辉

主要内容:
企图用内激波的反向激波解释早期的X射线的变平。

精彩摘抄:


文章信息:

astro-ph/0701204 [abs, ps, pdf, other] :

Title: Can the early X-ray afterglow of GRBs be explained by a contribution from the reverse shock?
Authors: Franck Genet (1), Frederic Daigne (1), Robert Mochkovitch (1) ((1) Institut d'Astrophysique de Paris, UMR7095 CNRS-Universite Pierre et Marie Curie-Paris 6)
Comments: 19 pages, 4 pages, revised version

We propose to explain the recent observations of GRB early X-ray afterglows with SWIFT by the dissipation of energy in the reverse shock which crosses the ejecta as it is decelerated by the burst environment. We compute the evolution of the dissipated power and discuss the possibility that a fraction of it can be radiated in the X-ray range. We show that this reverse shock contribution behaves in a way very similar to the observed X-ray afterglows if the following two conditions are satisfied: (i) the Lorentz factor of the material which is ejected during the late stages of source activity decreases to small values Gamma <>