Polarization Position Angle Swing and the Rotating Vector Model of Repeating Fast Radio Bursts

作者：Xiaohui 小辉 Liu 刘, Heng Xu, Jiarui Niu, Yongkun Zhang, Jinchen 金辰 Jiang 姜, D. J. Zhou, J. L. Han, Weiwei Zhu, Kejia 柯伽 Lee 李, Di Li, Weiyang Wang, Bing Zhang, Xuelei Chen, Jia-Wei 佳伟 Luo 罗, Rui Luo, Chenhui Niu, Yuanhong Qu, Bojun 铂钧 Wang 王, F. Y. Wang, Pei Wang, Tian-Cong Wang, Qin 沁 Wu 吴, Ziwei Wu, Jiangwei 江伟 Xu 徐, Yuan-Pei Yang, Junshuo Zhang · 发表于：The Astrophysical Journal · 年份：2025 · DOI：10.3847/1538-4357/ade689 · 被引用次数：11 · 研究领域：Pulsars and Gravitational Waves Research、Gamma-ray bursts and supernovae、GNSS positioning and interference

Abstract Fast radio bursts (FRBs), typically highly polarized, usually have a nearly constant polarization position angle (PA) during each burst. Some bursts show significant PA variations, and one of them was claimed to have a PA variation pattern consistent with the prediction of the rotating vector model (RVM) commonly adopted to fit the PA variations in radio pulsars. We systematically study the PA evolution pattern of 1727 bursts from three active repeating FRB sources monitored by the Five-hundred-meter Aperture Spherical Radio Telescope. We identify 46 bursts whose PA variations are fully consistent with the RVM. However, the inferred geometrical parameters and rotation periods derived from these RVM fittings are inconsistent from each other. This suggests that the magnetosphere of the FRB central engine is constantly distorted by the FRB emitter and the magnetic configuration is dynamically evolving.