Institutional Repository of Radio Astronomy Research Laboratory
| Ninety percent circular polarization detected in a repeating fast radio burst | |
Jiang, Jinchen1; Xu, Jiangwei2,3; Niu, Jiarui1; Lee, Kejia1,2,4; Zhu, Weiwei1; Zhang, Bing5,6; Qu, Yuanhong5,6; Xu, Heng1; Zhou, Dejiang1; Cao, Shunshun2; Wang, Weiyang7; Wang, Bojun1; Cao, Shuo8; Zhang, Yongkun1; Zhang, Chunfeng1; Gan, Hengqian1; Han, Jinlin1; Hao, Longfei8; Huang, Yuxiang8; Jiang, Peng1; Li, Dongzi9; Li, Hui1; Li, Ye10; Li, Zhixuan8; Luo, Rui11; Men, Yunpeng12; Qian, Lei1; Sun, Jinghai1; Wang, Lin3; Xu, Yonghua8; Xu, Renxin2,14; Yang, Yuanpei13; Yao, Rui1; Yue, Youling1; Yu, Dongjun1; Yuan, Jianping15 ; Zhu, Yan1
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| 2025-02-10 | |
| Source Publication | NATIONAL SCIENCE REVIEW
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| ISSN | 2095-5138 |
| Volume | 12Issue:2Pages:7 |
| Contribution Rank | 15 |
| Abstract | 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. |
| Keyword | radio astronomy fast radio burst polarization |
| DOI | 10.1093/nsr/nwae293 |
| Indexed By | SCI |
| Language | 英语 |
| WOS Keyword | FREQUENCY-DEPENDENT POLARIZATION ; PULSAR EMISSION ; PSRCHIVE ; PSRFITS ; MODEL |
| Funding Project | National SKA Program of China ; Chinese Academy of Sciences |
| WOS Research Area | Science & Technology - Other Topics |
| WOS Subject | Multidisciplinary Sciences |
| WOS ID | WOS:001416683400001 |
| Publisher | OXFORD UNIV PRESS |
| Funding Organization | National SKA Program of China ; Chinese Academy of Sciences |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/7437 |
| Collection | 射电天文研究室_脉冲星研究团组 |
| Corresponding Author | Lee, Kejia; Zhu, Weiwei; Zhang, Bing |
| Affiliation | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China 2.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 3.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 4.Peking Univ, Beijing Laser Accelerat Innovat Ctr, Beijing 101400, Peoples R China 5.Univ Nevada, Nevada Ctr Astrophys, Las Vegas, NV 89154 USA 6.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA 7.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China 8.Chinese Acad Sci, Yunnan Observ, Kunming 650216, Yunnan, Peoples R China 9.Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA 10.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 11.Guangzhou Univ, Sch Phys & Elect Engn, Guangzhou 510006, Peoples R China 12.Max Planck Inst Radioastron, Dept Elect, D-53121 Bonn, Germany 13.Yunnan Univ, South Western Inst Astron Res, Kunming 650504, Yunnan, Peoples R China 14.Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China 15.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China |
| Recommended Citation 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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| Jiang-2025-Ninety pe（921KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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