论文标题
在快速无线电爆发的磁离子环境上
On the magnetoionic environments of fast radio bursts
论文作者
论文摘要
对法拉第旋转度量的观察，结合了分散度量，可用于推断无线电源的磁离子环境。我们通过沿视线$ \ langle b _ {\ parallel} \ rangle $在其宿主星系中得出估计的平均磁场强度来研究FRB的磁离子环境，并将其与银河脉冲脉冲和磁磁的磁力进行比较。我们发现，对于那些具有RM测量值的FRB，平均$ \ langle b _ {\ Parallel} \ rangle $为$ 1.77^{+9.01} _ { - 1.48} \，\rmμg$和$ 1.74^{+1.74^{+14.82}}更大但与银河脉冲星的分布不一致，$ 1.00^{+1.51} _ { - 0.60} \，\rmμg$。只有六个银河磁铁估计$ \ langle b _ {\ Parallel} \ rangle $。除了由于与银河系中心的距离，其价值异常高的PSR J1745--2900，其他三个来源的平均值为$ 1.70 \，\rmμg$，这在统计学上与$ \ langle b _ {\ parlallel} \ rangallel} \ rangle $ $ rangle $ culact and frs and frs and frs and frs and frs and frs frs and galact and calact and callact。磁铁$ \ langle b _ {\ Parallel} \ rangle $的演变没有明显的趋势，这是年龄或表面磁场强度的函数。靠近银河中心的银河脉冲星和磁铁的$ \ langle b _ {\ Parallel} \ rangle $值比其他Pulsars/Magnetars。我们讨论了这些结果对FRB 121102磁离子环境的含义，在磁场模型的背景下以及调用超质量黑洞的模型以及一般的FRB的起源。
Observations of the Faraday rotation measure, combined with the dispersion measure, can be used to infer the magnetoionic environment of a radio source. We investigate the magnetoionic environments of FRBs by deriving their estimated average magnetic field strengths along the line of sight $\langle B_{\parallel}\rangle$ in their host galaxies and comparing them with those of Galactic pulsars and magnetars. We find that for those FRBs with RM measurements, the mean $\langle B_{\parallel}\rangle$ is $1.77^{+9.01}_{-1.48}\,\rmμG$ and $1.74^{+14.82}_{-1.55}\,\rmμG$ using two different methods, which is slightly larger but not inconsistent with the distribution of Galactic pulsars, $1.00^{+1.51}_{-0.60}\,\rmμG$. Only six Galactic magnetars have estimated $\langle B_{\parallel}\rangle$. Excluding PSR J1745--2900 that has an anomalously high value due to its proximity with the Galactic Centre, the other three sources have a mean value of $1.70\,\rmμG$, which is statistically consistent with the $\langle B_{\parallel}\rangle$ distributions of both Galactic pulsars and FRBs. There is no apparent trend of evolution of magnetar $\langle B_{\parallel}\rangle$ as a function of age or surface magnetic field strength. Galactic pulsars and magnetars close to the Galactic Centre have relatively larger $\langle B_{\parallel}\rangle$ values than other pulsars/magnetars. We discuss the implications of these results for the magnetoionic environments of FRB 121102 within the context of magnetar model and the model invoking a supermassive black hole, and for the origin of FRBs in general.
