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arXiv 2001.10761astro-ph.HE
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快速射电暴的持续发光光度与自转测度是否相关?

Are persistent emission luminosity and rotation measure of fast radio bursts related?

Yuan-Pei Yang, Qiao-Chu Li, Bing Zhang

摘要:

快速射电暴(FRB)的物理起源至今仍不清楚。FRB源的多波长和偏振观测将有助于诊断其前身和环境。到目前为止,只有第一个重复源FRB 121102似乎与持续无线电发射在空间上重合。它的爆发也具有非常大的法拉第旋转测量值(RM),即,$|{\rm RM}|\sim10^5~{\rm rad~m^{-2}}$。我们表明,理论上应该有一个简单的关系RM和亮度的FRB源的持久源,如果观察到的RM主要来自持久发射区。FRB 121102遵循这种关系,假定持续发射区域中的磁场是高度有序的,并且驱动持续发射的相对论电子的数量与贡献RM的非相对论电子的数量相当。根据这种关系,所有其他本地化FRB源的持久性排放源的未检测与其相对较小的RM($\left|{\rm RM}\right|\lesssim{\rm a~few}\times100~{\rm rad~m^{-2}}$)一致。基于这幅图,大多数没有大RM的FRB不应该与明亮的持续源相关联。

英文摘要:

The physical origin of fast radio bursts (FRBs) is still unknown. Multiwavelength and polarization observations of an FRB source would be helpful to diagnose its progenitor and environment. So far only the first repeating source FRB 121102 appears to be spatially coincident with a persistent radio emission. Its bursts also have very large values of the Faraday rotation measure (RM) i.e., $|{\rm RM}|\sim10^5~{\rm rad~m^{-2}}$. We show that theoretically there should be a simple relation between RM and the luminosity of the persistent source of an FRB source if the observed RM mostly arises from the persistent emission region. FRB 121102 follows this relation given that the magnetic field in the persistent emission region is highly ordered and that the number of relativistic electrons powering the persistent emission is comparable to that of non-relativistic electrons that contribute to RM. The non-detections of persistent emission sources from all other localized FRB sources are consistent with their relatively small RMs ($\left|{\rm RM}\right|\lesssim{\rm a~few}\times100~{\rm rad~m^{-2}}$) according to this relation. Based on this picture, the majority of FRBs without a large RM are not supposed to be associated with bright persistent sources.

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