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| Synchrotron Polarization of a Hybrid Distribution of Relativistic Thermal and Nonthermal Electrons in Gamma-Ray Burst Prompt Emission | |
Kangfa, Cheng1; Mao JR(毛基荣)2,3,4 ; Zhao XH(赵晓红)2,3,4; Hongbang, Liu5; Kole, Merlin6; Produit, Nicolas7; Zhifu, Chen1
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| 发表期刊 | ASTROPHYSICAL JOURNAL
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| 2024-11-01 | |
| 卷号 | 975期号:2 |
| DOI | 10.3847/1538-4357/ad8234 |
| 产权排序 | 第2完成单位 |
| 收录类别 | SCI |
| 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. |
| 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 |
| 项目资助者 | 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 |
| 语种 | 英语 |
| 学科领域 | 天文学 ; 天体物理学 ; 高能天体物理学 ; 星系与宇宙学 |
| 文章类型 | Article |
| 出版者 | IOP Publishing Ltd |
| 出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
| ISSN | 0004-637X |
| URL | 查看原文 |
| WOS记录号 | WOS:001350281000001 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | DECAYING MAGNETIC-FIELD ; PARTICLE-ACCELERATION ; COLLISIONLESS SHOCKS ; JITTER RADIATION ; RECONNECTION ; FLARES ; AFTERGLOW ; DYNAMICS ; MODEL |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 版本 | 出版稿 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/27677 |
| 专题 | 星系类星体研究组 中国科学院天体结构与演化重点实验室 |
| 作者单位 | 1.School of Mathematics and Physics, Guangxi Minzu University, Nanning 530006, People's Republic of China; 2.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People's Republic of China; [email protected]; 3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Science, Kunming 650011, 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.School of Physical Science and Technology, Guangxi University, Nanning 530004, People's Republic of China; 6.Space Science Center, University of New Hampshire, Durham, NH 03824, USA; 7.Astronomy Department, University of Geneva, Chemin Pegasi, 51CH-1290 Versoix, Switzerland |
| 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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