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星期日, 一月 04, 2009

Medvedev 2008 PIC模拟看能否产生Fermi能观测到的高能光子

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Title:
GRB physics with Fermi
Authors:
Medvedev, Mikhail V.
Publication:
eprint arXiv:0901.0051
Publication Date:
12/2008
Origin:
ARXIV
Keywords:
Astrophysics
Comment:
6 pages; submitted to proc. of Huntsville 2008 symposium on GRBs
Bibliographic Code:
2009arXiv0901.0051M

Abstract

Radiation from GRBs in the prompt phase, flares and an afterglow is thought to be produced by accelerated electrons in magnetic fields. Such emission may be produced at collisionless shocks of baryonic outflows or at reconnection sites (at least for the prompt and flares) of the magnetically dominated (Poynting flux driven) outflows, where no shocks presumably form at all. An astonishing recent discovery is that during reconnection strong small-scale magnetic fields are produced via the Weibel instability, very much like they are produced at relativistic shocks. The relevant physics has been successfully and extensively studied with the PIC simulations in 2D and, to some extent, in 3D for the past few years. We discuss how these simulations predict the existence of MeV-range synchrotron/jitter emission in some GRBs, which can be observed with Fermi. Recent results on modeling of the spectral variability and spectral correlations of the GRB prompt emission in the Weibel-jitter paradigm applicable to both baryonic and magnetic-dominated outflows is reviewed with the emphasis on observational predictions.
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