论文标题
重复的快速无线电突发象征的频率依赖性极化
Frequency-dependent polarization of repeating fast radio bursts-implications for their origin
论文作者
论文摘要
快速无线电爆发（FRB）的极化，明亮的天文瞬变，包含有关其环境的关键信息。我们报告了五个重复的FRB的极化测量，其大量信号可以用两个望远镜进行宽频段观测。在较低频率下的较低极化的明显趋势被发现，可以很好地表征单个参数旋转量表（σRM），并通过多路径散射建模。具有较高σRM的源具有较高的RM幅度和散射时间尺度。具有最重要的σRM的两个来源，FRB 20121102a和FRB 20190520b，与紧凑的持续无线电源有关。这些特性表明在重复的FRB附近一个复杂的环境，例如超新星残留物或脉冲星云，与年轻人群产生一致。
The polarization of fast radio bursts (FRBs), bright astronomical transients, contains crucial information about their environments. We report polarization measurements of five repeating FRBs, the abundant signals of which enable wide-band observations with two telescopes. A clear trend of lower polarization at lower frequencies was found, which can be well characterized by a single parameter rotation-measure-scatter (σRM) and modeled by multi-path scatter. Sources with higher σRM have higher RM magnitude and scattering timescales. The two sources with the most substantial σRM, FRB 20121102A and FRB 20190520B, are associated with a compact persistent radio source. These properties indicate a complex environment near the repeating FRBs, such as a supernova remnant or a pulsar wind nebula, consistent with their arising from young populations.
