Wang 2008 伽玛暴光球层的高能中微子辐射

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· arXiv e-print (arXiv:0807.0290)

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Title:		Prompt TeV neutrinos from dissipative photospheres of gamma-ray bursts
Authors:		Wang, Xiang-Yu; Dai, Zi-Gao
Publication:		eprint arXiv:0807.0290
Publication Date:		07/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		10 pages, 2 figures, submitted on 06/06/2008
Bibliographic Code:		2008arXiv0807.0290W

Abstract

Recently, it was suggested that a photospheric component that results from the internal dissipation occurring in the optically thick inner parts of relativistic outflows may be present in the prompt $\gamma$/X-ray emission of gamma-ray bursts or X-ray flashes. We explore high-energy neutrino emission in this dissipative photosphere model, assuming that the composition of the outflow is baryon-dominated. We find that neutrino emission from proton-proton collision process constitutes a dominant component at energies $\epsilon_{\nu}\leq 10 {\rm TeV}$ and could be detected by ${\rm km^3}$ detectors, such as Icecube. Higher energies ($\geq10$ TeV) neutrino emission from proton-proton collision and photo-pion production processes could be significantly suppressed for dissipation at relatively small radii, due to efficient Bethe-Heitler cooling of protons and/or radiative cooling of the secondary mesons in the photosphere radiation. As the dissipation shocks continue further out, high energy neutrinos from photo-pion production process becomes dominant.

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