Panaitescu 2008 外激波解释瞬时阶段的E_p-E_gamma 关系

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不过介质密度既不是均匀介质也不是星风.

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Title:
An external-shock origin of the E_p-E_gamma relation for Gamma-Ray Bursts
Authors:
Panaitescu, A.
Publication:
eprint arXiv:0811.2163
Publication Date:
11/2008
Origin:
ARXIV
Keywords:
Astrophysics
Comment:
6 pages, to appear in MNRAS
Bibliographic Code:
2008arXiv0811.2163P
AbstractWe investigate the possibility that the E_p propto E_gamma^{1/2} relation between the peak energy E_p of the nuF_nu spectrum and energy output E_gamma for long-duration GRBs arises from the external shock produced by the interaction of a relativistic outflow with the ambient medium. To that aim, we take into account the dependence of all parameters which determine E_p and E_gamma on the radial distribution of the ambient medium density and find that the E_p-E_gamma relation can be explained if the medium around GRBs has a universal radial stratification. For various combinations of GRB radiative process (synchrotron or inverse-Compton) and dissipation mechanism (reverse or forward shock), we find that the circumburst medium must have a particle density with a radial distribution different than the R^{-2} expected for constant mass-loss rate and terminal speed.
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