Kavli Affiliate: Kejia Lee
| First 5 Authors: Xiaohui Liu, Heng Xu, Jiarui Niu, Yongkun Zhang, Jinchen Jiang
| Summary:
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 Telescope
(FAST). 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 fitting 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.
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