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Ninety percent circular polarization detected in a repeating fast radio burst

文献类型：期刊论文

作者Jiang, Jinchen15; Xu, Jiangwei13,14; Niu, Jiarui15; Lee, Kejia12,14,15; Zhu, Weiwei15; Zhang, Bing10,11; Qu, Yuanhong10,11; Xu, Heng15; Zhou, Dejiang15; Cao, Shunshun14
刊名NATIONAL SCIENCE REVIEW
出版日期2025-02-10
卷号12期号:2页码:7
关键词radio astronomy fast radio burst polarization
ISSN号2095-5138
DOI10.1093/nsr/nwae293
产权排序15
英文摘要Fast radio bursts (FRBs) are extra-galactic sources with unknown physical mechanisms. They emit millisecond-duration radio pulses with isotropic equivalent energy of $10<^>{36}$-$10<^>{41}$ ergs. This corresponds to a brightness temperature of FRB emission typically reaching the level of $10<^>{36}$ K, but can be as high as above $10<^>{40}$ K for sub-microsecond timescale structures, suggesting the presence of underlying coherent relativistic radiation mechanisms. Polarization carries key information to understand the physical origin of FRBs, with linear polarization usually tracing the geometric configuration of magnetic fields and circular polarization probing both intrinsic radiation mechanisms and propagation effects. Here we show that the repeating source FRB 20201124A emits $90.9\%\pm 1.1\%$ circularly polarized radio pulses. Such a high degree of circular polarization was unexpected in theory and unprecedented in observation in the case of FRBs, since such a high degree of circular polarization was only common among solar or Jovian radio activities, attributed to the sub-relativistic electrons. We note that there is no obvious correlation between the degree of circular polarization and burst fluence. Besides the high degree of circular polarization, we also detected a rapid swing and orthogonal jump in the position angle of linear polarization. The detection of high-degree circular polarization in FRB 20201124A, together with its linear polarization properties that show orthogonal modes, place strong constraints on FRB physical mechanisms, calling for an interplay between magnetospheric radiation and propagation effects in shaping the observed FRB radiation. The largest radio telescope FAST detects 90% circular polarization and rapidly changing linear polarization in the bursts of a fast radio burst (FRB) repeater, imposing new constraint on radiative mechanism of FRBs.
WOS关键词FREQUENCY-DEPENDENT POLARIZATION ; PULSAR EMISSION ; PSRCHIVE ; PSRFITS ; MODEL
资助项目National SKA Program of China ; Chinese Academy of Sciences
WOS研究方向Science & Technology - Other Topics
语种英语
WOS记录号WOS:001416683400001
出版者OXFORD UNIV PRESS
资助机构National SKA Program of China ; Chinese Academy of Sciences
源URL[http://ir.xao.ac.cn/handle/45760611-7/7436]  
专题脉冲星研究团组
通讯作者Lee, Kejia; Zhu, Weiwei; Zhang, Bing
作者单位1.Guangzhou Univ, Sch Phys & Elect Engn, Guangzhou 510006, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
3.Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
4.Chinese Acad Sci, Yunnan Observ, Kunming 650216, Yunnan, Peoples R China
5.Yunnan Univ, South Western Inst Astron Res, Kunming 650504, Yunnan, Peoples R China
6.Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China
7.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China
8.Max Planck Inst Radioastron, Dept Elect, D-53121 Bonn, Germany
9.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
10.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA
推荐引用方式
GB/T 7714		 Jiang, Jinchen,Xu, Jiangwei,Niu, Jiarui,et al. Ninety percent circular polarization detected in a repeating fast radio burst[J]. NATIONAL SCIENCE REVIEW,2025,12(2):7.
APA Jiang, Jinchen.,Xu, Jiangwei.,Niu, Jiarui.,Lee, Kejia.,Zhu, Weiwei.,...&Zhu, Yan.(2025).Ninety percent circular polarization detected in a repeating fast radio burst.NATIONAL SCIENCE REVIEW,12(2),7.
MLA Jiang, Jinchen,et al."Ninety percent circular polarization detected in a repeating fast radio burst".NATIONAL SCIENCE REVIEW 12.2(2025):7.

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