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The synchrotron polarization in decaying magnetic field in gamma-ray bursts
Cheng KF(程康法)1,2; Zhao XH(赵晓红)1,3,4; Bai JM(白金明)1,3,4
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2020-11-01
Volume498Issue:3Pages:3492-3502
DOI10.1093/mnras/staa2595
Contribution Rank第1完成单位
Indexed BySCI
Keywordmagnetic fields polarization radiation mechanisms: non-thermal transients: gamma-ray bursts
Abstract

Polarization can serve as a probe of the radiation mechanism and magnetic field (MF) configuration in gamma-ray bursts (GRBs). In the case of constant MF, the synchrotron polarization in the prompt phase of GRBs has been widely studied. In this paper, we consider the case of the decaying MF. We calculate the time-averaged and instantaneous synchrotron polarizations in a pulse for different viewing angles and for the large-scale decaying MF model, which can explain the so-called Band spectrum. We find that the on-axis time-averaged polarization degree (PD) in the energy band of 50-500 keV for the decaying large-scale MF model (similar to 0.6 for typical parameters) is higher than that in the constant MF model (similar to 0.5). An interesting result is the instantaneous PD in the off-axis case will experience a turnover, i.e. the PD will evolve from a positive value to a negative one. This suggests the polarization angle (PA) change by an angle of 90 degrees. Such a result is roughly consistent with the discovery of the PA evolution within a pulse in some bursts, such as GRB 170114A and GRB 160821A. Our result implies at least a part of bursts (off-axis bursts) should have the PA evolution in a pulse.

Funding ProjectNationalNatural Science Foundation of China[U1831135] ; NationalNatural Science Foundation of China[11991051] ; NationalNatural Science Foundation of China[2014FB188]
Funding OrganizationNationalNatural Science Foundation of China[U1831135, 11991051, 2014FB188]
Language英语
Subject Area天文学 ; 天体物理学 ; 高能天体物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0035-8711
URL查看原文
WOS IDWOS:000587752500032
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordPROMPT EMISSION ; LINEAR-POLARIZATION ; SPECTRAL CATALOG ; AFTERGLOW ; ELECTRONS ; RADIATION ; SHOCK
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/23933
Collection丽江天文观测站(南方基地)
中国科学院天体结构与演化重点实验室
Corresponding AuthorZhao XH(赵晓红)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, 650216, Kunming, China
2.University of the Chinese Academy of Sciences, Yuquan Road 19, Shijingshan Block, 100049 Beijing, China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 100012, Beijing, China
4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650216, Kunming, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Cheng KF,Zhao XH,Bai JM. The synchrotron polarization in decaying magnetic field in gamma-ray bursts[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,498(3):3492-3502.
APA Cheng KF,Zhao XH,&Bai JM.(2020).The synchrotron polarization in decaying magnetic field in gamma-ray bursts.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,498(3),3492-3502.
MLA Cheng KF,et al."The synchrotron polarization in decaying magnetic field in gamma-ray bursts".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 498.3(2020):3492-3502.
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