Multi-year polarimetric monitoring of four CHIME-discovered repeating fast radio bursts with FAST

被引：0

作者：

Feng, Yi ^{[1
,2
]}

Zhang, Yong-Kun ^{[3
]}

Xie, Jintao ^{[4
]}

Yang, Yuan-Pei ^{[5
,6
]}

Qu, Yuanhong ^{[7
,8
]}

Zhou, Dengke ^{[1
]}

Li, Di ^{[3
,9
]}

Zhang, Bing ^{[7
,8
]}

Zhu, Weiwei ^{[3
,10
]}

Lu, Wenbin ^{[11
,12
]}

Xu, Jiaying ^{[1
]}

Miao, Chenchen ^{[1
]}

Tian, Shiyan ^{[13
]}

Wang, Pei ^{[3
,10
]}

Yao, Ju-Mei ^{[14
]}

Niu, Chen-Hui ^{[15
]}

Niu, Jiarui ^{[3
]}

Xu, Heng ^{[3
]}

Jiang, Jinchen ^{[3
]}

Zhou, Dejiang ^{[3
]}

Liu, Zenan ^{[16
]}

Tsai, Chao-Wei ^{[3
,10
,17
]}

Dai, Zigao ^{[18
]}

Wu, Xuefeng ^{[6
]}

Wang, Fayin ^{[16
]}

Han, Jinlin ^{[3
]}

Lee, Kejia ^{[3
,19
,20
]}

Xu, Renxin ^{[19
,20
]}

Huang, Yongfeng ^{[16
,21
]}

Zou, Yuanchuan ^{[13
]}

Cao, Jinhuang ^{[3
]}

Chen, Xianglei ^{[3
]}

Fang, Jianhua ^{[1
]}

Li, Dongzi ^{[22
]}

Li, Ye ^{[6
]}

Lu, Wanjin ^{[3
]}

Luo, Jiawei ^{[23
]}

Luo, Jintao ^{[24
]}

Luo, Rui ^{[25
]}

Lyu, Fen ^{[26
]}

Wang, Bojun ^{[3
]}

Wang, Weiyang ^{[17
,19
,20
]}

Wu, Qin ^{[16
]}

Xue, Mengyao ^{[3
]}

Xiao, Di ^{[6
]}

Yu, Wenfei ^{[27
]}

Yuan, Jianping ^{[14
]}

Zhang, Chunfeng ^{[3
]}

Zhang, Junshuo ^{[3
,17
]}

Zhang, Lei ^{[3
]}

机构：

[1] Zhejiang Lab, Res Ctr Astron Comp, Hangzhou 311100, Peoples R China

[2] Zhejiang Univ, Inst Astron, Sch Phys, Hangzhou 310027, Peoples R China

[3] Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China

[4] Sichuan Univ Sci & Engn, Sch Comp Sci & Engn, Yibin 644000, Peoples R China

[5] Yunnan Univ, South Western Inst Astron Res, Kunming 650504, Peoples R China

[6] Chinese Acad Sci, Purple Mt Observ, Nanjing 210023, Peoples R China

[7] Univ Nevada, Nevada Ctr Astrophys, Las Vegas, NV 89154 USA

[8] Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA

[9] Tsinghua Univ, Dept Astron, New Cornerstone Sci Lab, Beijing 100084, Peoples R China

[10] Beijing Normal Univ, Inst Frontiers Astron & Astrophys, Beijing 102206, Peoples R China

[11] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[12] Univ Calif Berkeley, Theoret Astrophys Ctr, Berkeley, CA 94720 USA

[13] Huazhong Univ Sci & Technol, Sch Phys, Dept Astron, Wuhan 430074, Peoples R China

[14] Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China

[15] Cent China Normal Univ, Inst Astrophys, Wuhan 430079, Peoples R China

[16] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Peoples R China

[17] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[18] Univ Sci & Technol China, Sch Phys Sci, Dept Astron, Hefei 230026, Peoples R China

[19] Peking Univ, Dept Astron, Beijing 100871, Peoples R China

[20] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China

[21] Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing 210023, Peoples R China

[22] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[23] Hebei Normal Univ, Coll Phys, Shijiazhuang 050024, Peoples R China

[24] Chinese Acad Sci, Natl Time Serv Ctr, Xian 710600, Peoples R China

[25] Guangzhou Univ, Sch Phys & Mat Sci, Dept Astron, Guangzhou 510006, Peoples R China

[26] Anqing Normal Univ, Inst Astron & Astrophys, Anqing 246133, Peoples R China

[27] Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China

[28] Guizhou Normal Univ, Guizhou Prov Key Lab Radio Astron & Data Proc, Guiyang 550001, Peoples R China

来源：

SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY | 2025年 / 68卷 / 08期

基金：

中国国家自然科学基金;

关键词：

radio; fast radio bursts; polarization; INVERSE COMPTON-SCATTERING; POLARIZATION PROPERTIES; ROTATION MEASURE; CURVATURE RADIATION; DISPERSION MEASURE; NARROW SPECTRA; FRB; 121102; EMISSION; BUNCHES; ENVIRONMENT;

D O I：

10.1007/s11433-024-2668-5

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Fast radio bursts (FRBs) are bright, millisecond-duration radio emissions originating from cosmological distances. In this study, we report multi-year polarization measurements of four repeating FRBs initially discovered by the Canadian Hydrogen Intensity Mapping Experiment (CHIME): FRBs 20190117A, 20190208A, 20190303A, and 20190417A. We observed the four repeating FRBs with the Five-hundred-meter Aperture Spherical Radio Telescope (FAST), detecting a total of 66 bursts. Two bursts from FRB 20190417A exhibit a circular polarization signal-to-noise ratio greater than 7, with the highest circular polarization fraction recorded at 35.7%. While the bursts from FRBs 20190208A and 20190303A are highly linearly polarized, those from FRBs 20190117A and 20190417A show depolarization due to multi-path propagation, with sigma RM = 2.78 +/- 0.05 and 5.19 +/- 0.09 rad m-2, respectively. The linear polarization distributions among five repeating FRBs-FRBs 20190208A, 20190303A, 20201124A, 20220912A, and 20240114A-are nearly identical but show distinct differences from those of non-repeating FRBs. FRBs 20190117A, 20190303A, and 20190417A exhibit substantial rotation measure (RM) variations between bursts, joining other repeating FRBs in this behavior. Combining these findings with published results, 64% of repeating FRBs show RM variations greater than 50 rad m-2, and 21% exhibit RM reversals. A significant proportion of repeating FRBs reside in a dynamic magneto-ionic environment. The structure function of RM variations shows a power-law index of gamma similar to (0-0.8), corresponding to a shallow power spectrum alpha = -(gamma + 2) similar to -(2.0-2.8) of turbulence, if the RM variations are attributed to turbulence. This suggests that the variations are dominated by small-scale RM density fluctuations. We perform K-S tests to compare the RMs of repeating and non-repeating FRBs, which reveal a marginal dichotomy in the distribution of their RMs. We caution that the observed dichotomy may be due to the small sample size and selection biases.

引用

页数：15

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