论文标题
快速漂移扫描调查中发现的快速无线电爆发
A Fast Radio Burst discovered in FAST drift scan survey
论文作者
论文摘要
我们从181123年发现了高度分散的快速无线电爆发，该分析是使用$ \ sim $ 1500〜使用五百米的光圈球形射电望远镜（快速）获取的漂移扫描调查数据的分析。该脉冲具有三个不同的发射成分，它们在我们的1.0--1.5〜GHz观测带上的频率变化。我们测量峰值通量密度为$> 0.065 $ 〜jy，相应的通量$> 0.2 $ 〜jy〜ms。根据观察到的分散度度量1812〜cm $^{ - 3} $ 〜PC，我们推断出$ \ sim 1.9 $的红移。由此，我们估计峰值光度和各向同性能量分别为$ \ lyssim 2 \ times10^{43} $ 〜ERG〜S $^{ - 1} $和$ \ sillesim 2 \ times10^{40} $ 〜Erg。到目前为止，从调查中发现的一个FRB只有一个FRB，我们对事件率的限制是有限的。我们为FRB的通电率$> 0.025 $ 〜JY〜MS的每天900 FRB的事件率提供了95 \％的置信度下限。我们用快速进行四个小时对源进行了后续观察，但没有发现重复的爆发。我们讨论了这一发现的含义，以理解FRB的物理机制。
We report the discovery of a highly dispersed fast radio burst, FRB~181123, from an analysis of $\sim$1500~hr of drift-scan survey data taken using the Five-hundred-meter Aperture Spherical radio Telescope (FAST). The pulse has three distinct emission components, which vary with frequency across our 1.0--1.5~GHz observing band. We measure the peak flux density to be $>0.065$~Jy and the corresponding fluence $>0.2$~Jy~ms. Based on the observed dispersion measure of 1812~cm$^{-3}$~pc, we infer a redshift of $\sim 1.9$. From this, we estimate the peak luminosity and isotropic energy to be $\lesssim 2\times10^{43}$~erg~s$^{-1}$ and $\lesssim 2\times10^{40}$~erg, respectively. With only one FRB from the survey detected so far, our constraints on the event rate are limited. We derive a 95\% confidence lower limit for the event rate of 900 FRBs per day for FRBs with fluences $>0.025$~Jy~ms. We performed follow-up observations of the source with FAST for four hours and have not found a repeated burst. We discuss the implications of this discovery for our understanding of the physical mechanisms of FRBs.
