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Title: Linear Polarization, Circular Polarization, and Depolarization of Gamma-ray Bursts: A Simple Case of Jitter Radiation

Abstract

Linear and circular polarizations of gamma-ray bursts (GRBs) have been detected recently. We adopt a simplified model to investigate GRB polarization characteristics in this paper. A compressed two-dimensional turbulent slab containing stochastic magnetic fields is considered, and jitter radiation can produce the linear polarization under this special magnetic field topology. Turbulent Faraday rotation measure (RM) of this slab makes strong wavelength-dependent depolarization. The jitter photons can also scatter with those magnetic clumps inside the turbulent slab, and a nonzero variance of the Stokes parameter V can be generated. Furthermore, the linearly and circularly polarized photons in the optical and radio bands may suffer heavy absorptions from the slab. Thus we consider the polarized jitter radiation transfer processes. Finally, we compare our model results with the optical detections of GRB 091018, GRB 121024A, and GRB 131030A. We suggest simultaneous observations of GRB multi-wavelength polarization in the future.

Authors:
;  [1]
  1. Yunnan Observatories, Chinese Academy of Sciences, 650011 Kunming, Yunnan Province (China)
Publication Date:
OSTI Identifier:
22661218
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 838; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; COMPARATIVE EVALUATIONS; COSMIC GAMMA BURSTS; DEPOLARIZATION; DETECTION; FARADAY EFFECT; GAMMA RADIATION; MAGNETIC FIELDS; PHOTONS; POLARIZATION; SHOCK WAVES; STOCHASTIC PROCESSES; STOKES PARAMETERS; TOPOLOGY; TURBULENCE; TWO-DIMENSIONAL CALCULATIONS; WAVELENGTHS

Citation Formats

Mao, Jirong, and Wang, Jiancheng, E-mail: jirongmao@mail.ynao.ac.cn. Linear Polarization, Circular Polarization, and Depolarization of Gamma-ray Bursts: A Simple Case of Jitter Radiation. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA6628.
Mao, Jirong, & Wang, Jiancheng, E-mail: jirongmao@mail.ynao.ac.cn. Linear Polarization, Circular Polarization, and Depolarization of Gamma-ray Bursts: A Simple Case of Jitter Radiation. United States. doi:10.3847/1538-4357/AA6628.
Mao, Jirong, and Wang, Jiancheng, E-mail: jirongmao@mail.ynao.ac.cn. Sat . "Linear Polarization, Circular Polarization, and Depolarization of Gamma-ray Bursts: A Simple Case of Jitter Radiation". United States. doi:10.3847/1538-4357/AA6628.
@article{osti_22661218,
title = {Linear Polarization, Circular Polarization, and Depolarization of Gamma-ray Bursts: A Simple Case of Jitter Radiation},
author = {Mao, Jirong and Wang, Jiancheng, E-mail: jirongmao@mail.ynao.ac.cn},
abstractNote = {Linear and circular polarizations of gamma-ray bursts (GRBs) have been detected recently. We adopt a simplified model to investigate GRB polarization characteristics in this paper. A compressed two-dimensional turbulent slab containing stochastic magnetic fields is considered, and jitter radiation can produce the linear polarization under this special magnetic field topology. Turbulent Faraday rotation measure (RM) of this slab makes strong wavelength-dependent depolarization. The jitter photons can also scatter with those magnetic clumps inside the turbulent slab, and a nonzero variance of the Stokes parameter V can be generated. Furthermore, the linearly and circularly polarized photons in the optical and radio bands may suffer heavy absorptions from the slab. Thus we consider the polarized jitter radiation transfer processes. Finally, we compare our model results with the optical detections of GRB 091018, GRB 121024A, and GRB 131030A. We suggest simultaneous observations of GRB multi-wavelength polarization in the future.},
doi = {10.3847/1538-4357/AA6628},
journal = {Astrophysical Journal},
number = 2,
volume = 838,
place = {United States},
year = {Sat Apr 01 00:00:00 EDT 2017},
month = {Sat Apr 01 00:00:00 EDT 2017}
}