Razzaque, Soebur 2009 质子的长时间的同步辐射解释080916C延迟的高能观测

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Title:		Synchrotron radiation from ultra-high energy protons and the Fermi observations of GRB 080916C
Authors:		Razzaque, Soebur; Dermer, Charles D.; Finke, Justin D.
Publication:		eprint arXiv:0908.0513
Publication Date:		08/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		10 pages, 1 figure
Bibliographic Code:		2009arXiv0908.0513R

Abstract

Fermi gamma-ray telescope data of GRB 080916C with ~1e55 erg in apparent isotropic gamma-ray energy, show a several second delay between the rise of 100 MeV - GeV radiation compared with keV - MeV radiation. Here we show that synchrotron radiation from cosmic ray protons accelerated in a GRB, delayed by the proton synchrotron cooling timescale in a jet of magnetically-dominated shocked plasma moving at highly relativistic speeds, explains this Fermi result. A second generation electron synchrotron component from attenuated proton synchrotron radiation makes enhanced soft X-ray to MeV gamma-ray emission. Such GRBs with narrow, energetic jets accelerating particles to ultra-high energies could explain the Auger observations of ultra-high energy cosmic rays from sources within 100 Mpc for nano-Gauss intergalactic magnetic fields.

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