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Time-integrated Polarization of Structured Jets in Gamma-Ray Burst Prompt Emission

文献类型：期刊论文

作者Mai, Qiannan3; Liu, Hongbang3; Tuo, Jiangchuan3; Feng, Zuke3; Zhong, Qian3; Cheng, Kangfa2; Mao JR(毛基荣)1; Liang, Enwei3
刊名ASTROPHYSICAL JOURNAL
出版日期2025-08-01
卷号988期号:2
ISSN号0004-637X
DOI10.3847/1538-4357/ade4c4
产权排序第3完成单位
文献子类Article
英文摘要The structure of gamma-ray burst (GRB) jets remains one of the most significant open questions in high-energy astrophysics. Observations of events like GRB 170817A, associated with gravitational waves, and the exceptionally bright GRB 221009A suggest that jets may be structured rather than uniform. Polarization studies offer a powerful tool to probe jet structures, complementing traditional spectral analyses. This study examines the polarization degree (PD) of two types of structured jets under different magnetic field configurations (MFCs). The first type features a core with constant energy per unit solid angle, transitioning to a power-law decay at the edges. The second type exhibits a continuous decay of both energy per unit solid angle and Lorentz factor, controlled by a decay index. Additionally, motivated by jet-ambient medium interactions, we introduce a structured magnetic field model: the jet core region is dominated by an ordered magnetic field, while the ratio of ordered to random field strengths in the jet outer region follows a power-law decay. The results show that structured jets with ordered magnetic fields exhibit higher PD than uniform jets, especially when viewed off-axis, while random magnetic fields have minimal impact on structured jet PD. The PD difference between on-axis and off-axis observations decreases for jets with a shallow decay index, contrasting with uniform jets. If observed, PD shows little variation with fluence ratio, which strongly indicates a structured jet. Furthermore, within the structured magnetic field framework, random fields generally suppress polarization, but the random MFC can enhance off-axis polarization to some extent.
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 ; PHOTOSPHERIC EMISSION ; LINEAR-POLARIZATION ; LUMINOSITY FUNCTION ; AFTERGLOW EMISSION ; ENERGY ; MODEL ; POLARIMETRY ; EVOLUTION ; SPECTRA
资助项目MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[12027803]; MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[U1731239]; MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[12133003]; MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[U1938201]; National Natural Science Foundation of China; Guangxi Talent Program (Highland of Innovation Talents)
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001536501400001
出版者IOP Publishing Ltd
资助机构MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[12027803, U1731239, 12133003, U1938201] ; National Natural Science Foundation of China ; Guangxi Talent Program (Highland of Innovation Talents)
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/28470]  
专题星系类星体研究组
通讯作者Liu, Hongbang
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, Yunnan Province, People’s Republic of China
2.School of Physics and Electronic Information, Guangxi Minzu University, Nanning 530006, People’s Republic of China;
3.Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University, Nanning 530004, People’s Republic of China; liuhb@gxu.edu.cn;
推荐引用方式
GB/T 7714		 Mai, Qiannan,Liu, Hongbang,Tuo, Jiangchuan,et al. Time-integrated Polarization of Structured Jets in Gamma-Ray Burst Prompt Emission[J]. ASTROPHYSICAL JOURNAL,2025,988(2).
APA Mai, Qiannan.,Liu, Hongbang.,Tuo, Jiangchuan.,Feng, Zuke.,Zhong, Qian.,...&Liang, Enwei.(2025).Time-integrated Polarization of Structured Jets in Gamma-Ray Burst Prompt Emission.ASTROPHYSICAL JOURNAL,988(2).
MLA Mai, Qiannan,et al."Time-integrated Polarization of Structured Jets in Gamma-Ray Burst Prompt Emission".ASTROPHYSICAL JOURNAL 988.2(2025).

入库方式： OAI收割

来源：云南天文台

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