Bellm, Eric C. 2009 用RHESSI的数据测试伽玛暴为黑体谱的可能性

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实际上是黑体+幂律

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Title:		RHESSI Tests of Quasi-Thermal Gamma-Ray Burst Spectral Models
Authors:		Bellm, Eric C.
Publication:		eprint arXiv:0908.2433
Publication Date:		08/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		14 pages, 17 figures; submitted to ApJ
Bibliographic Code:		2009arXiv0908.2433B

Abstract

Prompt gamma-ray burst spectra evolve on short time scales, suggesting that time-resolved spectral fits may help diagnose the still unknown prompt emission mechanism. We use broad-band gamma-ray data from the RHESSI spacecraft to test quasi-thermal models with high signal-to-noise time-resolved spectra of nine bright gamma-ray bursts. In contrast to results reported in more narrow energy bands, the quality of the fits of quasi-thermal models is poor in relation to fits of the phenomenological Band function. Moreover, the best-fit parameters for the simplest quasi-thermal model, a black body plus a nonthermal power law, show significant dependence on the fit band. Models that replace the power law with more complicated nonthermal functions are not robust for the data considered here and decrease the physical relevance of the fit black body.

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