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Circular Polarization in two Active Repeating Fast Radio Bursts

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arxiv 2212.05873 v1 pith:PMFSKDOM submitted 2022-12-12 astro-ph.HE

Yi Feng , Yong-Kun Zhang , Di Li , Yuan-Pei Yang , Pei Wang , Chen-Hui Niu , Shi Dai , Ju-Mei Yao This is my paper
classification astro-ph.HE
keywords polarizationcircularfrbsburstsradiorepeatingactivedetect
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Fast radio bursts (FRBs) are bright millisecond radio bursts at cosmological distances. Only a small fraction of FRBs apparently repeat. Polarization, a fundamental property of electromagnetic signals, often carries critical information about the radiation processes, the environment, and the intervening medium of FRBs. Here we report circular polarization detections of two active repeating FRBs, namely FRBs 20121102A and 20190520B, with the Five-hundred-meter Aperture Spherical radio Telescope. We detect circular polarization in both active repeating FRBs, which increases the number of repeating FRBs with circular polarization to three. In one of the bursts of FRB 20121102A, we detect 64% degree of circular polarization. The observed circular polarization is unlikely induced by multipath propagation. Our observations favor circular polarization induced by Faraday conversion or radiation mechanism intrinsic to the FRB source. The conditions to generate circular polarization have to be rare in either case.

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  1. Multi-year Polarimetric Monitoring of Four CHIME-Discovered Repeating Fast Radio Bursts with FAST

    astro-ph.HE 2025-07 conditional novelty 5.0 of 10

    Multi-year FAST polarimetry of four repeating FRBs reveals strong RM variability in 64% of known repeaters and a shallow turbulence spectrum in the surrounding plasma.

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