论文标题
银河系和宇宙学快速无线电爆发的统一图片
A unified picture of Galactic and cosmological fast radio bursts
论文作者
论文摘要
与磁铁（具有强磁场的中子星）相关的星系中的快速无线电爆发（FRB）的发现提供了关键信息，以帮助我们最终了解这些神秘的瞬变。我们表明，类似事件的银河系-FRB的体积速率与宇宙学FRB速率的微弱端一致，因此它们很可能属于同一类瞬态。银河系的FRB伴有X射线爆发，但来自同一物体的许多X射线爆发都没有无线电。他们的相对速率表明，对于每个FRB，大约有10^2至10^3 X射线突发。银河系FRB的无线电弯曲在400-800 MHz频带中有两个尖峰，分别为30 ms。这是一类模型类别的重要线索，高度限制了无线电发射在磁盘的光缸外产生的。我们建议，接近磁场表面的磁干扰传播到几十个中子星形半径的距离，在那里它们会潮湿并产生无线电发射。在这种情况下，可以理解与此爆发中看到的两个FRB脉冲以及两个频带之间的磁通比相关的一致的硬X射线尖峰。该模型为诸如银河FRB之类的微弱爆发以及在宇宙学距离上看到的明亮事件提供了统一的图片。
The discovery of a fast radio burst (FRB) in our galaxy associated with a magnetar (neutron star with strong magnetic field) has provided a critical piece of information to help us finally understand these enigmatic transients. We show that the volumetric rate of Galactic-FRB like events is consistent with the faint end of the cosmological FRB rate, and hence they most likely belong to the same class of transients. The Galactic FRB had an accompanying X-ray burst but many X-ray bursts from the same object had no radio counterpart. Their relative rates suggest that for every FRB there are roughly 10^2 to 10^3 X-ray bursts. The radio lightcurve of the galactic FRB had two spikes separated by 30 ms in the 400-800 MHz frequency band. This is an important clue and highly constraining of the class of models where the radio emission is produced outside the light-cylinder of the magnetar. We suggest that magnetic disturbances close to the magnetar surface propagate to a distance of a few tens of neutron star radii where they damp and produce radio emission. The coincident hard X-ray spikes associated with the two FRB pulses seen in this burst and the flux ratio between the two frequency bands can be understood in this scenario. This model provides a unified picture for faint bursts like the Galactic FRB as well as the bright events seen at cosmological distances.
