Zhang 2009 GRB 080916C可能有Poynting流的证据

主要内容:
高能没有任何热成份, 说明不是完全由重子组成.

"a thermal component as predicted by the baryonic models" 有重子就一定有热成份吗? 为什么?


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Title:		Evidence of a non-baryonic composition in GRB 080916C
Authors:		Zhang, Bing; Pe'er, Asaf
Publication:		eprint arXiv:0904.2943
Publication Date:		04/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		ApJL, submitted
Bibliographic Code:		2009arXiv0904.2943Z

Abstract

The composition of gamma-ray burst (GRB) ejecta is still a mystery. The standard model invokes an initially hot "fireball" composed of baryonic matter. Here we analyze the broad band spectra of GRB 080916C detected by the Fermi satellite. The featureless Band-spectrum of all five epochs as well as the detections of >~ 10 GeV photons in this burst place a strong constraint on the prompt emission radius >~ 10^{15} cm, independent on the details of the emission process. The lack of the detection of a thermal component as predicted by the baryonic models strongly suggests that a significant fraction of the outflow energy is initially not in the "fireball" form, but is likely in a Poynting flux entrained with the baryonic matter. The ratio between the Poynting and the baryonic flux is at least ~(15-20).

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