论文标题
两个主动重复快速无线电爆发中的圆形极化
Circular Polarization in two Active Repeating Fast Radio Bursts
论文作者
论文摘要
快速无线电爆发（FRB）是宇宙学距离处明亮的毫秒无线电爆发。显然只有一小部分FRB重复。极化，是电磁信号的基本特性，通常会带有有关辐射过程，环境和FRB的中间介质的关键信息。在这里，我们报告了两个主动重复的FRB的循环极化检测，即FRB 20121102a和20190520b，其中五百米的光圈球形射电望远镜。我们在两个主动重复的FRB中都检测到圆极化，这将圆极化的重复FRB数量增加到三个。在FRB 20121102a的爆发之一中，我们检测到64％的圆极化程度。多径传播不太可能引起观察到的圆极化。我们的观察结果有利于FRB源固有的Faraday转换或辐射机制引起的圆极化。在任何一种情况下，产生圆极化的条件都必须很少见。
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.
