Multi-year Polarimetric Monitoring of Four CHIME-Discovered Repeating Fast Radio Bursts with FAST
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866911036337029120 |
|---|---|
| author | Feng, Yi Zhang, Yong-Kun Xie, Jintao Yang, Yuan-Pei Qu, Yuanhong Zhou, Dengke Li, Di Zhang, Bing Zhu, Weiwei Lu, Wenbin Xu, Jiaying Miao, Chenchen Tian, Shiyan Wang, Pei Yao, Ju-Mei Niu, Chen-Hui Niu, Jiarui Xu, Heng Jiang, Jinchen Zhou, Dejiang Liu, Zenan Tsai, Chao-Wei Dai, Zigao Wu, Xuefeng Wang, Fayin Han, Jinlin Lee, Kejia Xu, Renxin Huang, Yongfeng Zou, Yuanchuan Cao, Jinhuang Chen, Xianglei Fang, Jianhua Li, Dongzi Li, Ye Lu, Wanjin Luo, Jiawei Luo, Jintao Luo, Rui Lyu, Fen Wang, Bojun Wang, Weiyang Wu, Qin Xue, Mengyao Xiao, Di Yu, Wenfei Yuan, Jianping Zhang, Chunfeng Zhang, Junshuo Zhang, Lei Zhang, Songbo Zhao, Rushuang Zhu, Yuhao |
| author_facet | Feng, Yi Zhang, Yong-Kun Xie, Jintao Yang, Yuan-Pei Qu, Yuanhong Zhou, Dengke Li, Di Zhang, Bing Zhu, Weiwei Lu, Wenbin Xu, Jiaying Miao, Chenchen Tian, Shiyan Wang, Pei Yao, Ju-Mei Niu, Chen-Hui Niu, Jiarui Xu, Heng Jiang, Jinchen Zhou, Dejiang Liu, Zenan Tsai, Chao-Wei Dai, Zigao Wu, Xuefeng Wang, Fayin Han, Jinlin Lee, Kejia Xu, Renxin Huang, Yongfeng Zou, Yuanchuan Cao, Jinhuang Chen, Xianglei Fang, Jianhua Li, Dongzi Li, Ye Lu, Wanjin Luo, Jiawei Luo, Jintao Luo, Rui Lyu, Fen Wang, Bojun Wang, Weiyang Wu, Qin Xue, Mengyao Xiao, Di Yu, Wenfei Yuan, Jianping Zhang, Chunfeng Zhang, Junshuo Zhang, Lei Zhang, Songbo Zhao, Rushuang Zhu, Yuhao |
| contents | In this study, we report multi-year polarization measurements of four repeating FRBs initially discovered by CHIME: FRBs~20190117A, 20190208A, 20190303A, and 20190417A. We observed the four repeating FRBs with 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 σ_{\mathrm{RM}} = 2.78 \pm 0.05 rad m$^{-2}$ and 5.19 \pm 0.09 rad m$^{-2}$, respectively. The linear polarization distributions among five repeating FRB--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 $γ\sim (0-0.8)$, corresponding to a shallow power spectrum $α= -(γ+ 2) \sim -(2.0-2.8)$ 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 comparing 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_02355 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Multi-year Polarimetric Monitoring of Four CHIME-Discovered Repeating Fast Radio Bursts with FAST Feng, Yi Zhang, Yong-Kun Xie, Jintao Yang, Yuan-Pei Qu, Yuanhong Zhou, Dengke Li, Di Zhang, Bing Zhu, Weiwei Lu, Wenbin Xu, Jiaying Miao, Chenchen Tian, Shiyan Wang, Pei Yao, Ju-Mei Niu, Chen-Hui Niu, Jiarui Xu, Heng Jiang, Jinchen Zhou, Dejiang Liu, Zenan Tsai, Chao-Wei Dai, Zigao Wu, Xuefeng Wang, Fayin Han, Jinlin Lee, Kejia Xu, Renxin Huang, Yongfeng Zou, Yuanchuan Cao, Jinhuang Chen, Xianglei Fang, Jianhua Li, Dongzi Li, Ye Lu, Wanjin Luo, Jiawei Luo, Jintao Luo, Rui Lyu, Fen Wang, Bojun Wang, Weiyang Wu, Qin Xue, Mengyao Xiao, Di Yu, Wenfei Yuan, Jianping Zhang, Chunfeng Zhang, Junshuo Zhang, Lei Zhang, Songbo Zhao, Rushuang Zhu, Yuhao High Energy Astrophysical Phenomena In this study, we report multi-year polarization measurements of four repeating FRBs initially discovered by CHIME: FRBs~20190117A, 20190208A, 20190303A, and 20190417A. We observed the four repeating FRBs with 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 σ_{\mathrm{RM}} = 2.78 \pm 0.05 rad m$^{-2}$ and 5.19 \pm 0.09 rad m$^{-2}$, respectively. The linear polarization distributions among five repeating FRB--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 $γ\sim (0-0.8)$, corresponding to a shallow power spectrum $α= -(γ+ 2) \sim -(2.0-2.8)$ 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 comparing 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. |
| title | Multi-year Polarimetric Monitoring of Four CHIME-Discovered Repeating Fast Radio Bursts with FAST |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2507.02355 |