Neamus 2010 GRB 090510是否可有正向激波解释多波段观测

主要内容:

同步辐射不能解释多波段的拐折，而SSC模型需要星风环境，和它是断暴不符。所以总的说来，可能高能和低能并不都来自于外激波(标准喷流余辉)。

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Title:		Can the forward-shock model account for the multiwavelength emission of GRB afterglow 090510 ?
Authors:		Neamus, Ano
Publication:		eprint arXiv:1005.1051
Publication Date:		05/2010
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		9 pages
Bibliographic Code:		2010arXiv1005.1051N

Abstract

GRB 090510 is the first burst whose afterglow emission above 100 MeV was measured by Fermi over two decades in time. Owing to its power-law temporal decay and power-law spectrum, it seems likely that the high-energy emission is from the forward-shock energizing the ambient medium (the standard blast-wave model for GRB afterglows), the GeV flux and its decay rate being consistent with that model's expectations. However, the synchrotron emission from a collimated outflow (the standard jet model) has difficulties in accounting for the lower-energy afterglow emission, where a simultaneous break occurs in the optical and X-ray light-curves at 2 ks, but with the optical flux decay (before and after the break) being much slower than in the X-rays (at same time). The measured X-ray and GeV fluxes are incompatible with the higher-energy afterglow emission being from same spectral component as the lower-energy afterglow emission, which suggests a synchrotron self-Compton model for this afterglow. Cessation of energy injection in the blast-wave can account for the optical and X-ray light-curves provided that the ambient medium has a wind-like n propto r^{-2} density. The latter is incompatible with this short-GRB originating from the merger of two compact stars.

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