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Synchrotron Polarization of Anisotropic Electron Distribution in GRB Prompt Emission

文献类型：期刊论文

作者Cheng, Kang-Fa1,2; Luo, Kai-Xian2; Zhao XH(赵晓红)3,4; Mao JR(毛基荣)3,4; Liu, Hong-Bang1; Mo, Yu-Hang2; Huang, Jin-Rong2; Weng, Rong-Li2; Xie, Wen-Jie2; Yu, Gao-Jin2
刊名ASTROPHYSICAL JOURNAL
出版日期2026-06-01
卷号1003期号:2
ISSN号0004-637X
DOI10.3847/1538-4357/ae63b9
产权排序第3完成单位
文献子类Article
英文摘要In gamma-ray bursts (GRBs), the electron pitch angle (alpha) is usually assumed to be isotropically distributed. However, recent numerical simulations indicate that only the high-energy electrons (with Lorentz factors gamma > gamma(iso)) are distributed isotropically, whereas the low-energy electrons (with gamma < gamma(iso)) follow an energy-dependent anisotropic distribution during magnetic reconnection. The mean value of sin(2)alpha approximately follows the relation < sin(2)alpha >proportional to gamma(m) for gamma < gamma(iso). In principle, polarization measurements may help us constrain the pitch-angle distribution of electrons in GRBs, since different pitch-angle distributions produce distinct synchrotron polarization signatures. The polarization of GRBs produced by isotropically distributed electrons has been extensively studied. In this paper, we investigate synchrotron polarization produced by anisotropically distributed electrons within a globally toroidal magnetic field in GRB prompt emission. Our results show that the synchrotron polarization degrees (PDs) in the gamma-ray and X-ray bands produced by anisotropically distributed electrons are systematically lower than those produced by isotropically distributed electrons, while the PD in the optical band could be either lower or higher than that of isotropically distributed electrons, depending primarily on the value of the energy slope m. In addition, we compared our numerical results with observational data, and the comparison suggests that an anisotropic distribution of electrons may offer a potential explanation for the PD and spectral data of some GRBs.
学科主题天文学 ; 天体物理学 ; 高能天体物理学 ; 星系与宇宙学
URL标识查看原文
出版地No.2 The Distillery, Glassfields, Avon Street, Bristol, ENGLAND
WOS关键词GAMMA-RAY BURSTS ; DECAYING MAGNETIC-FIELD ; PARTICLE-ACCELERATION ; SPECTRAL CATALOG ; ANGLE ; RECONNECTION ; EVOLUTION ; RADIATION ; ION
资助项目Scientific Research Project of Guangxi Minzu University[2021KJQD03]; National Key R&D Program of China[2023YFE0101200]; Yunnan Revitalization Talent Support Program[YunLing Scholar Project]; College Students' Innovative Entrepreneurial Training Plan Program[S202410608023]; National Natural Science Foundation of China[12473048]; (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) divided by Natural Science Foundation of Guangxi Zhuang Autonomous Region (Guangxi Natural Science Foundation)[2024GXNSFBA010350]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001770198000001
出版者IOP Publishing Ltd
资助机构Scientific Research Project of Guangxi Minzu University[2021KJQD03] ; National Key R&D Program of China[2023YFE0101200] ; Yunnan Revitalization Talent Support Program[YunLing Scholar Project] ; College Students' Innovative Entrepreneurial Training Plan Program[S202410608023] ; National Natural Science Foundation of China[12473048] ; (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) divided by Natural Science Foundation of Guangxi Zhuang Autonomous Region (Guangxi Natural Science Foundation)[2024GXNSFBA010350]
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/29229]  
专题星系类星体研究组
通讯作者Mao JR(毛基荣)
作者单位1.Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University, Nanning 530004, People’s Republic of China;
2.School of Physics and Electronic Information, Guangxi Minzu University, Nanning 530006, People’s Republic of China;
3.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People’s Republic of China; jirongmao@mail.ynao.ac.cn;
4.Center for Astronomical Mega-Science, Chinese Academy of Science, 20A Datun Road, Chaoyang District, Beijing 100012, People’s Republic of China
推荐引用方式
GB/T 7714		 Cheng, Kang-Fa,Luo, Kai-Xian,Zhao XH,et al. Synchrotron Polarization of Anisotropic Electron Distribution in GRB Prompt Emission[J]. ASTROPHYSICAL JOURNAL,2026,1003(2).
APA Cheng, Kang-Fa.,Luo, Kai-Xian.,赵晓红.,毛基荣.,Liu, Hong-Bang.,...&Yu, Gao-Jin.(2026).Synchrotron Polarization of Anisotropic Electron Distribution in GRB Prompt Emission.ASTROPHYSICAL JOURNAL,1003(2).
MLA Cheng, Kang-Fa,et al."Synchrotron Polarization of Anisotropic Electron Distribution in GRB Prompt Emission".ASTROPHYSICAL JOURNAL 1003.2(2026).

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来源：云南天文台

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