Circular polarization in two active repeating fast radio bursts

• DOI: 10.1016/j.scib.2022.11.014
• Publication Date: 2022-11-16T03:59:57Z
• Authors: Yi Feng; Yong-Kun Zhang; Di Li; Yuan-Pei Yang; Pei Wang; Chen-Hui Niu; Shi Dai; Ju-Mei Yao
• Keywords: Faraday cage

Fast radio bursts (FRBs) are bright millisecond at cosmological distances. Only a small fraction of FRBs apparently repeat. Polarization, fundamental property electromagnetic signals, often carries critical information about the radiation processes, environment, and intervening medium FRBs. Here we report circular polarization detections two active repeating FRBs, namely 20121102A 20190520B, with Five-hundred-meter Aperture Spherical Telescope. We detect in both which increases number to three. In one FRB 20121102A, 64% degree polarization. The observed is unlikely induced by multipath propagation. Our observations favor Faraday conversion or mechanism intrinsic source. conditions generate have be rare either case.