Mao, Jirong 2013 Jitter emission的偏振

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Title:		Application of Jitter Radiation: Gamma-Ray Burst Prompt Polarization
Authors:		Mao, Jirong; Wang, Jiancheng
Affiliation:		AA(Astrophysical Big Bang Lab, RIKEN, Saitama 351-0198, Japan ; Yunnan Observatory, Chinese Academy of Sciences, 650011 Kunming, Yunnan Province, China ; Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650011 Kunming, China; jirong.mao@riken.jp), AB(Yunnan Observatory, Chinese Academy of Sciences, 650011 Kunming, Yunnan Province, China ; Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650011 Kunming, China)
Publication:		The Astrophysical Journal, Volume 776, Issue 1, article id. 17, 9 pp. (2013). (ApJ Homepage)
Publication Date:		10/2013
Origin:		IOP
Astronomy Keywords:		gamma-ray burst: general, radiation mechanisms: non-thermal, shock waves, turbulence
DOI:		10.1088/0004-637X/776/1/17
Bibliographic Code:		2013ApJ...776...17M

Abstract

A high degree of polarization of gamma-ray burst (GRB) prompt emission has been confirmed in recent years. In this paper, we apply jitter radiation to study the polarization feature of GRB prompt emission. In our framework, relativistic electrons are accelerated by turbulent acceleration. Random and small-scale magnetic fields are generated by turbulence. We further determine that the polarization property of GRB prompt emission is governed by the configuration of the random and small-scale magnetic fields. A two-dimensional compressed slab, which contains a stochastic magnetic field, is applied in our model. If the jitter condition is satisfied, the electron deflection angle in the magnetic field is very small and the electron trajectory can be treated as a straight line. A high degree of polarization can be achieved when the angle between the line of sight and the slab plane is small. Moreover, micro-emitters with mini-jet structures are considered to be within a bulk GRB jet. The jet "off-axis" effect is intensely sensitive to the observed polarization degree. We discuss the depolarization effect on GRB prompt emission and afterglow. We also speculate that the rapid variability of GRB prompt polarization may be correlated with the stochastic variability of the turbulent dynamo or the magnetic reconnection of plasmas.

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