论文标题
磁场围绕一个主动快速无线电爆发逆转
Magnetic Field Reversal around an Active Fast Radio Burst
论文作者
论文摘要
积极重复快速无线电爆发（FRB）的环境已被证明是复杂且变化的。最近局部局部的FRB 20190520b非常活跃，具有最大的确认宿主分散度度量，并且是与紧凑的持久无线电源（PRS）相关的第二个FRB源。磁离子环境的主要示踪剂是旋转度量（RM），这是磁场强度（B）和电子密度的视线组分的路径集成，它不允许直接探测B场构型。 Here we report direct evidence for a B-field reversal based on the observed sign change and extreme variation of FRB 20190520B's RM, which changed from $\sim10000$ rad m$^{-2}$ to $\sim-16000$ rad m$^{-2}$ between June 2021 and January 2022. Such extreme RM reversal has never been observed before in any FRB nor in any astronomical object. FRB内或周围的B场构型的隐含短期变化可能是由于巨大的黑洞附近，或二进制系统中的磁化伴侣恒星，或沿视线沿线的年轻超新星残留物。
The environment of actively repeating fast radio bursts (FRBs) has been shown to be complex and varying. The recently localized FRB 20190520B is extremely active, has the largest confirmed host dispersion measure, and is only the second FRB source associated with a compact, persistent radio source (PRS). The main tracer of the magneto-ionic environments is the rotation measure (RM), a path-integral of the line-of-sight component of magnetic field strength (B) and electron density, which does not allow a direct probe of the B-field configuration. Here we report direct evidence for a B-field reversal based on the observed sign change and extreme variation of FRB 20190520B's RM, which changed from $\sim10000$ rad m$^{-2}$ to $\sim-16000$ rad m$^{-2}$ between June 2021 and January 2022. Such extreme RM reversal has never been observed before in any FRB nor in any astronomical object. The implied short-term change of the B-field configuration in or around the FRB could be due to the vicinity of massive black holes, or a magnetized companion star in binary systems, or a young supernova remnant along the line of sight.
