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Title: APPLICATION OF JITTER RADIATION: GAMMA-RAY BURST PROMPT POLARIZATION

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 ormore » the magnetic reconnection of plasmas.« less
Authors:
 [1] ;  [2]
  1. Astrophysical Big Bang Lab, RIKEN, Saitama 351-0198 (Japan)
  2. Yunnan Observatory, Chinese Academy of Sciences, 650011 Kunming, Yunnan Province (China)
Publication Date:
OSTI Identifier:
22270895
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 776; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AFTERGLOW; ASTRONOMY; ASTROPHYSICS; COSMIC GAMMA BURSTS; DEPOLARIZATION; ELECTRONS; JETS; MAGNETIC FIELDS; MAGNETIC RECONNECTION; PLASMA; POLARIZATION; RANDOMNESS; RELATIVISTIC RANGE; SHOCK WAVES; STOCHASTIC PROCESSES; TURBULENCE; TWO-DIMENSIONAL CALCULATIONS