论文标题
frb $ - $ srb $ - $ xrb：来自银河磁铁SGR J1935+2154
FRB$-$SRB$-$XRB: Geometric and Relativistic Beaming Constraints of Fast Radio Bursts from the Galactic Magnetar SGR J1935+2154
论文作者
论文摘要
FRB 200428的快速无线电爆发（FRB）的检测，与银河磁铁软伽玛中继器（SGR）SGR J1935+2154相一致，这表明磁铁可以产生FRB。从源头检测到许多XRB，但很少有人发现与爆发无线电发射有关。同时，从源头检测到了许多较弱的无线电爆发，原则上可能是缓慢的无线电爆发（SRB）：在FRB喷射锥外观察角处检测到的FRB。在本文中，我们使用这些X射线和无线电观测来限制FRB在两个假设下的几何和相对论的光束因子。首先，我们假设所有SRB都应与FRB 200428这样的XRB关联。我们使用FRB-SRB闭合关系来识别两个SRB，并得出FRB光束必须是几何狭窄的，$θ_j\ lyssim 10^{ - 2} $ rad，并遵循$θ_Jjγ\ sim2 $。其次，我们假设SRB的严格约束不太严格，因为它们不需要与XRB相关联。我们总共确定了七个SRB，其中五个具有高斯样光谱，并得出了FRB光束因子再次遵循$θ_Jγ\ sim2 $。
The detection of a fast radio burst (FRB), FRB 200428, coincident with an X-ray burst (XRB) from the Galactic magnetar soft gamma repeater (SGR) SGR J1935+2154 suggests that magnetars can produce FRBs. Many XRBs have been detected from the source, but very few were found to be associated with bursty radio emission. Meanwhile, a number of weaker radio bursts have been detected from the source, which could in principle be slow radio bursts (SRBs): FRBs detected at viewing angles outside the FRB jet cone. In this paper, we use these X-ray and radio observations to constrain the geometric and relativistic beaming factors of FRBs under two hypotheses. First, we assume that all SRBs should be associated with XRBs like FRB 200428. We use the FRB-SRB closure relations to identify two SRBs and derive that FRB beaming must be geometrically narrow, $θ_j \lesssim 10^{-2}$ rad, and follow $θ_jΓ\sim2$. Second, we assume a less stringent constraint for SRBs by not requiring that they are associated with XRBs. We identify a total of seven SRBs, five of which have Gaussian-like spectra, and derive that FRB beaming factors again follow $θ_jΓ\sim2$.
