论文标题
在重复快速无线电爆发的循环极化上
On the Circular Polarisation of Repeating Fast Radio Bursts
论文作者
论文摘要
具有超强磁场（或所谓的磁场）的快速旋转（例如，次秒）中子星是重复快速无线电爆发（FRB）的有前途的起源之一。在这里，我们讨论了在快速旋转磁场的磁层中传播效应产生的圆极化排放。我们认为，极化限制区域远远超出了光缸，这表明波模式耦合效应不太可能为快速旋转磁铁产生强圆极化。如果次级等离子体密度高，则感染感应可能很重要。但是，高度的圆极化只能在电子和正上方的较大的不对称物体中产生。我们将注意力集中在当前对已知重复FRB的当前观察结果中的未检测。我们建议FRB的圆极化可以提供有关其起源的关键信息，并有助于区分不同的辐射机制。
Fast spinning (e.g., sub-second) neutron star with ultra-strong magnetic fields (or so-called magnetar) is one of the promising origins of repeating fast radio bursts (FRBs). Here we discuss circularly polarised emissions produced by propagation effects in the magnetosphere of fast spinning magnetars. We argue that the polarisation-limiting region is well beyond the light cylinder, suggesting that wave mode coupling effects are unlikely to produce strong circular polarisation for fast spinning magnetars. Cyclotron absorption could be significant if the secondary plasma density is high. However, high degrees of circular polarisation can only be produced with large asymmetries in electrons and positrons. We draw attention to the non-detection of circular polarisation in current observations of known repeating FRBs. We suggest that the circular polarisation of FRBs could provide key information on their origins and help distinguish different radiation mechanisms.
