Neronov 2010 磁化外流体的质子辐射作为伽马暴的辐射机制

主要内容:

质子占主导的small pitch angle synchrotron emission辐射MeV的光子，低能段能产生光子谱指数为-1或者0。

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谱

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Title:		Gamma ray emission from magnetized relativistic GRB outflows
Authors:		Neronov, A.; Savchenko, V.
Publication:		eprint arXiv:1007.3288
Publication Date:		07/2010
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		5 pages, 1 figure, accepted for publication in A&A letters; doi:10.1051/0004-6361/201015212
Bibliographic Code:		2010arXiv1007.3288N

Abstract

We argue that small pitch angle synchrotron emission provides an important dissipation mechanism which has to be taken into account in the models of formation of relativistic magnetized gamma-ray burst (GRB) outflows from the newborn black holes and/or magnetars. We show that if the GRB outflow is proton loaded, spectral energy distribution of this emission is expected to sharply peak in 0.1-1~MeV energy band. If the small pitch angle synchrotron emission efficiently cools relativistic particles of the outflow, its spectrum below the peak energy is a powerlaw with spectral index alpha ~ -1, close to the typical spectral index of the time-resolved GRB spectra. Otherwise, the low energy spectral index can be as hard as alpha ~ 0, as observed at the beginning of the GRB pulses. We make a conjecture that small pitch angle synchrotron emission from proton-loaded magnetized GRB outflow could significantly contribute to the Band component of the prompt emission of GRBs while electromagnetic cascade initiated by the protons could be responsible for the GeV component.

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