An Extremely Active Repeating Fast Radio Burst Source in a Likely Nonmagneto-ionic Environment

被引：12

作者：

Feng, Yi ^{[1
,2
]}

Li, Di ^{[1
,3
,4
]}

Zhang, Yong-Kun ^{[4
,5
]}

Tsai, Chao-Wei ^{[4
,5
,6
]}

Qu, Yuanhong ^{[7
,8
]}

Wang, Wei-Yang ^{[5
,9
,10
]}

Yang, Yuan-Pei ^{[11
,12
]}

Wang, Pei ^{[4
,6
]}

Zhou, Dengke ^{[1
]}

Niu, Jiarui ^{[4
]}

Miao, Chenchen ^{[4
]}

Yuan, Mao ^{[4
]}

Xu, Jiaying ^{[1
]}

Lynch, Ryan S. ^{[13
]}

Armentrout, William Paul ^{[13
]}

Gregory, Brenne ^{[13
]}

Meng, Lingqi ^{[4
]}

Wang, Shen ^{[14
]}

Chen, Xianglei ^{[4
]}

Dai, Shi ^{[15
]}

Niu, Chen-Hui ^{[4
,16
]}

Xue, Mengyao ^{[4
]}

Yao, Ju-Mei ^{[17
]}

Zhang, Bing ^{[7
,8
]}

Zhang, Junshuo ^{[4
]}

Zhu, Weiwei ^{[4
,6
]}

Xie, Jintao ^{[1
]}

Zhu, Yuhao ^{[4
,5
]}

机构：

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

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

[3] Tsinghua Univ, Dept Astron, Beijing 100084, Peoples R China

[4] Chinese Acad Sci, R P China, Beijing 100101, Peoples R China

[5] Univ Chinese Acad Sci, Beijing, Peoples R China

[6] Beijing Normal Univ, Inst Frontiers Astron & Astrophys, Beijing, 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] Peking Univ, Dept Astron, Beijing, Peoples R China

[10] Peking Univ, Beijing 100871, Peoples R China

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

[12] Chinese Acad Sci, R P China, Guiyang 210023, Peoples R China

[13] Green Bank Observ, Green Bank, WV 24944 USA

[14] Fudan Univ, Sch Comp Sci, Shanghai, Peoples R China

[15] Western Sydney Univ, Sch Sci, Penrith, NSW 1797, Australia

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

[17] Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 550001, Xinjiang, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2024年 / 974卷 / 02期

基金：

中国国家自然科学基金; 国家重点研发计划; 美国国家科学基金会;

关键词：

MAGNETOSPHERIC CURVATURE RADIATION; SYNCHROTRON MASER EMISSION; ROTATION MEASURE; MAGNETIC-FIELD; FRB; 121102; POLARIZATION; DISPERSION; SCATTERING; DISCOVERY; GEOMETRY;

D O I：

10.3847/1538-4357/ad7a64

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Fast radio bursts (FRBs) are bright radio bursts originating at cosmological distances. Only three repeating FRBs FRB 20121102A, FRB 20190520B, and FRB 20201124A among similar to 60 known repeating FRBs have circular polarization. We observed the FRB 20220912A with the Robert C. Byrd Green Bank Telescope (GBT) at L-band on 2022 October 24 and detected 128 bursts in 1.4 hr, corresponding to a burst rate of about 90 hr-1, which is the highest yet for FRBs observed by the GBT. The average rotation measure (RM) was -0.4 +/- 0.3 rad m-2 with negligible intraday RM change, indicating a likely nonmagneto-ionic environment. A total of 61% of bursts have a linear polarization fraction greater than 90%. Approximately 56% of the bright bursts have circular polarization. A downward drift in frequency and polarization angle swings were found in our sample. The characterization of FRB 20220912A indicates that the circular polarization is unlikely to be caused by the magneto-ionic environment for at least some of the repeating FRB population.

引用

页数：9

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