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Synchrotron Polarization of a Hybrid Distribution of Relativistic Thermal and Nonthermal Electrons in Gamma-Ray Burst Prompt Emission

文献类型：期刊论文

作者Kangfa, Cheng7; Mao JR(毛基荣)4,5,6; Zhao XH(赵晓红)4,5,6; Hongbang, Liu3; Kole, Merlin2; Produit, Nicolas1; Zhifu, Chen7
刊名ASTROPHYSICAL JOURNAL
出版日期2024-11-01
卷号975期号:2
ISSN号0004-637X
DOI10.3847/1538-4357/ad8234
产权排序第2完成单位
文献子类Article
英文摘要Synchrotron polarization of relativistic nonthermal electrons in gamma-ray bursts (GRBs) has been widely studied. However, recent numerical simulations of relativistic shocks and magnetic reconnection have found that a more realistic electron distribution consists of a power-law component plus a thermal component, which requires observational validation. In this paper, we investigate synchrotron polarization using a hybrid energy distribution of relativistic thermal and nonthermal electrons within a globally toroidal magnetic field in GRB prompt emission. Our results show that compared to the case of solely nonthermal electrons, the synchrotron polarization degrees (PDs) in these hybrid electrons can vary widely, depending on different parameters, and that the PD decreases progressively with frequency in the gamma-ray, X-ray, and optical bands. The time-averaged PD spectrum displays a significant bump in the gamma-ray and X-ray bands, with the PDs higher than similar to 60% if the thermal peak energy of the electrons is much smaller than the conjunctive energy of the electrons between the thermal and nonthermal distributions. The high-synchrotron PDs (greater than or similar to 60%) in the gamma-ray and X-ray bands, which generally cannot be produced by solely nonthermal electrons with typical power-law slopes, can be achieved by hybrid electrons and primarily originates from the exponential decay part of the thermal component. Moreover, this model can roughly explain the PDs and spectral properties of some GRBs, where GRB 110301A with a high PD ( 70-22+22% ) may be potential evidence for the existence of relativistic thermal electrons.
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DECAYING MAGNETIC-FIELD ; PARTICLE-ACCELERATION ; COLLISIONLESS SHOCKS ; JITTER RADIATION ; RECONNECTION ; FLARES ; AFTERGLOW ; DYNAMICS ; MODEL
资助项目Natural Science Foundation of Guangxi Zhuang Autonomous Region (Guangxi Natural Science Foundation)https://doi.org/10.13039/100012547[2024GXNSFBA010350]; Guangxi Natural Science Foundation[2021KJQD03]; Scientific Research Project of Guangxi Minzu University[2023YFE0101200]; National Key R&D Program of China[U1831135]; National Key R&D Program of China[12393813]; National Key R&D Program of China[12393811]; National Natural Science Foundation of China; Yunnan Revitalization Talent Support Program
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001350281000001
出版者IOP Publishing Ltd
资助机构Natural Science Foundation of Guangxi Zhuang Autonomous Region (Guangxi Natural Science Foundation)https://doi.org/10.13039/100012547[2024GXNSFBA010350] ; Guangxi Natural Science Foundation[2021KJQD03] ; Scientific Research Project of Guangxi Minzu University[2023YFE0101200] ; National Key R&D Program of China[U1831135, 12393813, 12393811] ; National Natural Science Foundation of China ; Yunnan Revitalization Talent Support Program
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/27677]  
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.Astronomy Department, University of Geneva, Chemin Pegasi, 51CH-1290 Versoix, Switzerland
2.Space Science Center, University of New Hampshire, Durham, NH 03824, USA;
3.School of Physical Science and Technology, Guangxi University, Nanning 530004, People's Republic of China;
4.Center for Astronomical Mega-Science, Chinese Academy of Science, 20A Datun Road, Chaoyang District, Beijing 100012, People's Republic of China;
5.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Science, Kunming 650011, People's Republic of China;
6.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People's Republic of China; jirongmao@mail.ynao.ac.cn;
7.School of Mathematics and Physics, Guangxi Minzu University, Nanning 530006, People's Republic of China;
推荐引用方式
GB/T 7714		 Kangfa, Cheng,Mao JR,Zhao XH,et al. Synchrotron Polarization of a Hybrid Distribution of Relativistic Thermal and Nonthermal Electrons in Gamma-Ray Burst Prompt Emission[J]. ASTROPHYSICAL JOURNAL,2024,975(2).
APA Kangfa, Cheng.,毛基荣.,赵晓红.,Hongbang, Liu.,Kole, Merlin.,...&Zhifu, Chen.(2024).Synchrotron Polarization of a Hybrid Distribution of Relativistic Thermal and Nonthermal Electrons in Gamma-Ray Burst Prompt Emission.ASTROPHYSICAL JOURNAL,975(2).
MLA Kangfa, Cheng,et al."Synchrotron Polarization of a Hybrid Distribution of Relativistic Thermal and Nonthermal Electrons in Gamma-Ray Burst Prompt Emission".ASTROPHYSICAL JOURNAL 975.2(2024).

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来源：云南天文台

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