Murase 2008 电子对在星际空间的echo

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跟星际磁场关系很大

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Title:		Possible Effects of Pair Echos on Gamma-Ray Burst Afterglow Emission
Authors:		Murase, Kohta; Zhang, Bing; Takahashi, Keitaro; Nagataki, Shigehiro
Publication:		eprint arXiv:0812.0124
Publication Date:		11/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		7 pages, 6 fugures
Bibliographic Code:		2008arXiv0812.0124M

Abstract

High-energy emission from gamma-ray bursts (GRBs) is highly expected but had been sparsely observed until recently when the Fermi satellite was launched. We investigate how pair echo emission affects spectra and light curves of high energy afterglow, considering not only prompt emission but also afterglow as the primary emission. Detection of pair echos is possible as long as the intergalactic magnetic field (IGMF) in voids is weak. We find (1) that the pair echo from the primary afterglow emission can affect the observed high-energy emission in the afterglow phase after the jet break, and (2) that the pair echo from the primary prompt emission can be also relevant, but only when significant energy is emitted in the TeV range, typically E_{gamma, >0.1 TeV}/ epsilon_e E_k > 1. Even non-detections of the pair echos could place interesting constraints on the strength of IGMF. The more promising targets to detect pair echoes may be the "naked" short GRBs without conventional afterglow emission. If the IGMF is weak enough, it is predicted that the GeV emission extends to > 30-300 s.

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