论文标题
FRB发射银河系的宽带X射线爆发光谱
Broadband X-ray Burst Spectroscopy of the FRB-Emitting Galactic Magnetar
论文作者
论文摘要
磁铁是年轻的，磁性的中子星，具有宇宙中最强的磁场。快速无线电爆发（FRB）是主要强度的毫秒长的无线电脉冲，主要是外层次的起源，其创世纪的主要归因于磁铁。磁铁的标志性签名是它们发射明亮的，硬X射线的次秒持续时间。 2020年4月27日，银河磁铁SGR J1935+2154在几个小时内散发出数百次X射线爆发。这些时间上的一个与FRB相吻合，这是对银河系中FRB的首次检测。在这里，我们介绍了在FRB前13小时发射的24 X射线爆发的光谱和时间分析，并在其合并能量范围内与NASA NASA和FERMI/GBM任务同时看到0.2 KEV-30 MEV。这些宽带光谱允许直接比较与FRB相关的X射线爆发（FRB-X）。我们证明，所有24个更好的/GBM爆发在时间上都是非常相似的，尽管在频方面与FRB-X差异很大。 FRB-X爆发的奇异性可能表明其起源不常见。我们建议该事件起源于准极极开或封闭的磁场线，该线延伸至高度。
Magnetars are young, magnetically-powered neutron stars possessing the strongest magnetic fields in the Universe. Fast Radio Bursts (FRBs) are extremely intense millisecond-long radio pulses of primarily extragalactic origin, and a leading attribution for their genesis focuses on magnetars. A hallmark signature of magnetars is their emission of bright, hard X-ray bursts of sub-second duration. On April 27th 2020, the Galactic magnetar SGR J1935+2154 emitted hundreds of X-ray bursts in a few hours. One of these temporally coincided with an FRB, the first detection of an FRB from the Milky Way. Here we present spectral and temporal analyses of 24 X-ray bursts emitted 13 hours prior to the FRB and seen simultaneously with the NASA NICER and Fermi/GBM missions in their combined energy range, 0.2 keV-30 MeV. These broadband spectra permit direct comparison with the spectrum of the FRB-associated X-ray burst (FRB-X). We demonstrate that all 24 NICER/GBM bursts are very similar temporally, albeit strikingly different spectrally, from FRB-X. The singularity of the FRB-X burst is perhaps indicative of an uncommon locale for its origin. We suggest that this event originated in quasi-polar open or closed magnetic field lines that extend to high altitudes.
