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Rotation of Polarization Angle in Gamma-Ray Burst Prompt Phase

Authors :
Hao-Bing Wang
Mi-Xiang Lan
Source :
The Astrophysical Journal, Vol 946, Iss 1, p 12 (2023)
Publication Year :
2023
Publisher :
IOP Publishing, 2023.

Abstract

The rotations of the polarization angle (PA) with time (energy) can lead to the depolarization of the time-integrated (energy-integrated) polarization. However, we do not know how and when it will rotate. Here, we consider a magnetic reconnection model to investigate the polarizations, especially the PA rotations of gamma-ray burst (GRB) prompt emission. For a large-scale ordered aligned magnetic field configuration, we find that within T _50 PAs will rotate with time (energy) for slight off-axis observations. Our studies show that the rotations of the PAs are due to changes in the observed image of the emitting region before being averaged over the equal arrival time surface for the unresolved sources. We apply our model to the single-pulse bursts of GRB 170101A and GRB 170114A with time-resolved PA observations. We find it can interpret the violent PA variation of GRB 170101A, while the model could not predict the two 90° PA changes in GRB 170114A. A more detailed model should be considered.

Details

Language :
English
ISSN :
15384357
Volume :
946
Issue :
1
Database :
Directory of Open Access Journals
Journal :
The Astrophysical Journal
Publication Type :
Academic Journal
Accession number :
edsdoj.fa22e68acfb244118b0ba263f2f01d90
Document Type :
article
Full Text :
https://doi.org/10.3847/1538-4357/acba0c