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Synchrotron Circular Polarization in Gamma-Ray Burst Prompt Optical Emission: Relativistic Thermal Electron Contribution

文献类型：期刊论文

作者Cheng, Kangfa1,2; Mao JR(毛基荣)3,4,5; Zhao XH(赵晓红)3,4,5; Liu, Hongbang1; Chen, Zhegeng1,2; Yu, Gaojin2; Chen, Zhifu2
刊名ASTROPHYSICAL JOURNAL
出版日期2025-05-20
卷号985期号:1
ISSN号0004-637X
DOI10.3847/1538-4357/add1d7
产权排序第3完成单位
文献子类Article
英文摘要Synchrotron circular polarization of a nonthermal power-law electron distribution in gamma-ray bursts (GRBs) has been studied. However, some numerical simulations have shown that the resulting distribution of electrons is a combination of a thermal component and a nonthermal power-law component. In this paper, we investigate synchrotron circular polarization using such a hybrid energy distribution of relativistic thermal and nonthermal electrons within a globally toroidal magnetic field in GRB prompt optical emission. Our results show that compared to the solely nonthermal electron model, the synchrotron circular polarization degree (PD) in the hybrid electron model can vary widely in the optical band, depending on different parameters. The lower the electron temperature, the higher the circular PD. The time-averaged circular PD in the hybrid electron model can be higher than similar to 1% when the electron temperature is as low as similar to 1010 K, while in the solely nonthermal electron model it is usually lower than similar to 1%. We further calculate the radiative transfer of the circular and linear polarization in the optical band. Our results show that both of the circular and linear PDs decrease with the increase of optical depth, but the linear PDs decline faster than the circular PDs. To further examine the physical mechanisms of both radiation and particle acceleration, we expect that instruments will be capable of measuring the circular polarization of GRB prompt optical emission in the future.
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TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
WOS关键词MAGNETIC-FIELD STRUCTURE ; PARTICLE-ACCELERATION ; COLLISIONLESS SHOCKS ; LINEAR-POLARIZATION ; JITTER RADIATION ; AFTERGLOW ; RECONNECTION ; PREDICTIONS ; POLARIMETRY ; GENERATION
资助项目Scientific Research Project of Guangxi Minzu University; Guangxi Natural Science Foundation[GUIKEAD22035945]; National Key R&D Program of China[2023YFE0101200]; National Natural Science Foundation of China[12393813]; National Natural Science Foundation of China[12393811]; National Natural Science Foundation of China[12027803]; Yunnan Revitalization Talent Support Program;[2021KJQD03]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001491010100001
出版者IOP Publishing Ltd
资助机构Scientific Research Project of Guangxi Minzu University ; Guangxi Natural Science Foundation[GUIKEAD22035945] ; National Key R&D Program of China[2023YFE0101200] ; National Natural Science Foundation of China[12393813, 12393811, 12027803] ; Yunnan Revitalization Talent Support Program ; [2021KJQD03]
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/28312]  
专题星系类星体研究组
云南天文台_中国科学院天体结构与演化重点实验室
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.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Science, Kunming 650011, People's Republic of China;
5.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, Kangfa,Mao JR,Zhao XH,et al. Synchrotron Circular Polarization in Gamma-Ray Burst Prompt Optical Emission: Relativistic Thermal Electron Contribution[J]. ASTROPHYSICAL JOURNAL,2025,985(1).
APA Cheng, Kangfa.,毛基荣.,赵晓红.,Liu, Hongbang.,Chen, Zhegeng.,...&Chen, Zhifu.(2025).Synchrotron Circular Polarization in Gamma-Ray Burst Prompt Optical Emission: Relativistic Thermal Electron Contribution.ASTROPHYSICAL JOURNAL,985(1).
MLA Cheng, Kangfa,et al."Synchrotron Circular Polarization in Gamma-Ray Burst Prompt Optical Emission: Relativistic Thermal Electron Contribution".ASTROPHYSICAL JOURNAL 985.1(2025).

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来源：云南天文台

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