FAST Observations of an Extremely Active Episode of FRB 20201124A. III. Polarimetry
文献类型：期刊论文
| 作者 | Jiang, Jin-Chen14,15; Wang, Wei-Yang13,15; Xu, Heng13,14,15; Xu, Jiang-Wei13,14,15; Zhang, Chun-Feng13,14,15; Wang, Bo-Jun13,14,15; Zhou, De-Jiang12,14; Zhang, Yong-Kun12,14; Niu, Jia-Rui12,14; Lee, Ke-Jia13,14,15 |
| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2022-12-01 |
| 卷号 | 22期号:12页码:18 |
| ISSN号 | 1674-4527 |
| 关键词 | (stars:) pulsars: general stars: magnetars radio continuum: general polarization |
| DOI | 10.1088/1674-4527/ac98f6 |
| 通讯作者 | Jiang, Jin-Chen(jiangjinchen@pku.edu.cn) ; Zhang, Bing(bing.zhang@unlv.edu) |
| 英文摘要 | As the third paper in the multiple-part series, we report the statistical properties of radio bursts detected from the repeating fast radio burst (FRB) source FRB 20201124A with the Five-hundred-meter Aperture Spherical radio Telescope during an extremely active episode between the 25th and 28th of September 2021 (UT). We focus on the polarization properties of 536 bright bursts with S/N > 50. We found that the Faraday rotation measures (RMs) monotonically dropped from -579 to -605 rad m(-2) in the 4 day window. The RM values were compatible with the values (-300 to -900 rad m(-2)) reported 4 months ago. However, the RM evolution rate in the current observation window was at least an order of magnitude smaller than the one (similar to 500 rad m(-2) day(-1)) previously reported during the rapid RM-variation phase, but is still higher than the one (<= 1 rad m(-2) day(-1)) during the later RM no-evolution phase. The bursts of FRB 20201124A were highly polarized with the total degree of polarization (circular plus linear) greater than 90% for more than 90% of all bursts. The distribution of linear polarization position angles (PAs), degree of linear polarization (L/I) and degree of circular polarization (V/I) can be characterized with unimodal distribution functions. During the observation window, the distributions became wider with time, i.e., with larger scatter, but the centroids of the distribution functions remained nearly constant. For individual bursts, significant PA variations (confidence level 5 sigma) were observed in 33% of all bursts. The polarization of single pulses seems to follow certain complex trajectories on the Poincare sphere, which may shed light on the radiation mechanism at the source or the plasma properties along the path of FRB propagation. |
| WOS关键词 | FAST RADIO-BURST ; FREQUENCY-DEPENDENT POLARIZATION ; EMISSION ; ROTATION ; PSRCHIVE ; BUNCHES ; PSRFITS |
| 资助项目 | National SKA Program of China[2020SKA0120100] ; National SKA Program of China[2020SKA0120200] ; National Key R&D Program of China[2017YFA0402602] ; National Natural Science Foundation of China (NSFC)[12041303] ; National Natural Science Foundation of China (NSFC)[11988101] ; National Natural Science Foundation of China (NSFC)[11833009] ; CAS-MPG LEGACY project ; Max-Planck Partner Group ; Key Research Program of the Chinese Academy of Sciences[QYZDJ-SSW-SLH021] ; Cultivation Project for the FAST scientific Payoff and Research Achievement of CAMS-CAS ; Key Research Project of Zhejiang Lab[2021PE0AC0] ; National Natural Science Foundation of China[12003028] ; China Manned Spaced Project[CMS-CSST-2021-B11] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES |
| WOS记录号 | WOS:000905280600001 |
| 资助机构 | National SKA Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; CAS-MPG LEGACY project ; Max-Planck Partner Group ; Key Research Program of the Chinese Academy of Sciences ; Cultivation Project for the FAST scientific Payoff and Research Achievement of CAMS-CAS ; Key Research Project of Zhejiang Lab ; National Natural Science Foundation of China ; China Manned Spaced Project |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/5023]  |
| 专题 | 脉冲星研究团组 科研仪器设备产出_我台利用FAST观测数据文章 |
| 通讯作者 | Jiang, Jin-Chen; Zhang, Bing |
| 作者单位 | 1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 2.Yunnan Univ, South Western Inst Astron Res, Kunming 650504, Yunnan, Peoples R China 3.Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing, Peoples R China 4.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Peoples R China 5.CSIRO Space & Astron, POB 76, Epping, NSW 1710, Australia 6.CALTECH, Cahill Ctr Astron & Astrophys, MC 249 17, Pasadena, CA 91125 USA 7.Univ Sci & Technol China, Dept Astron, Hefei 230026, Peoples R China 8.Univ KwaZulu Natal, NAOC UKZN Computat Astrophys Ctr, ZA-4000 Durban, South Africa 9.Res Ctr Intelligent Comp Platforms, Zhejiang Lab, Hangzhou 311100, Peoples R China 10.Chinese Acad Sci, CAS Key Lab FAST, NAOC, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Jiang, Jin-Chen,Wang, Wei-Yang,Xu, Heng,et al. FAST Observations of an Extremely Active Episode of FRB 20201124A. III. Polarimetry[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2022,22(12):18. |
| APA | Jiang, Jin-Chen.,Wang, Wei-Yang.,Xu, Heng.,Xu, Jiang-Wei.,Zhang, Chun-Feng.,...&Yuan, Mao.(2022).FAST Observations of an Extremely Active Episode of FRB 20201124A. III. Polarimetry.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,22(12),18. |
| MLA | Jiang, Jin-Chen,et al."FAST Observations of an Extremely Active Episode of FRB 20201124A. III. Polarimetry".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 22.12(2022):18. |
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