论文标题
Parkes和快速FRB DM分布的比较
Comparison of the Parkes and FAST FRB DM Distribution
论文作者
论文摘要
我们对五百米的光圈球形望远镜（FAST）进行快速无线电爆发（FRB）色散度量（DM）分布进行建模，并将其与迄今为止在文献中发表的四个FRB进行比较。我们比较了Parkes和Fast的DM分布，利用了其多光束接收器之间的相似性。尽管样本量有限，但对于所有考虑的所有进化模型，我们观察到低DM处的事件很少，从而在$ 1000 \ 1000 \ sillsim \ sillsim \ mathrm {dm} \ simsim {dm} \ lisssim2000 $ pc cm $ pc cm $^{ - 3} $的区域中观察到的累积分布函数（CDF）急剧上升。这些特征可能是由于统计波动（$ 0.12 \ le p \ le 0.22 $），一种复杂的能量分布或能量分配功率法，空间聚类，示例中的观察性偏见或异常值（例如，对于最近的FRB 20190520b）。在检测到进一步的事件之前，该制度中的能量分布不太可能受到充分的限制。建模表明，快速可以很好地区分红移进化模型并探测IGM的氦离子化信号。
We model the Fast Radio Burst (FRB) dispersion measure (DM) distribution for the Five-hundred-meter Aperture Spherical Telescope (FAST) and compare this with the four FRBs published in the literature to date. We compare the DM distribution of Parkes and FAST, taking advantage of the similarity between their multibeam receivers. Notwithstanding the limited sample size, we observe a paucity of events at low DM for all evolutionary models considered, resulting in a sharp rise in the observed cumulative distribution function (CDF) in the region of $1000\lesssim\mathrm{DM}\lesssim2000$ pc cm$^{-3}$. These traits could be due to statistical fluctuations ($0.12 \le p \le 0.22$), a complicated energy distribution or break in an energy distribution power law, spatial clustering, observational bias or outliers in the sample (e.g., an excessive DM_${HOST}$ as recently found for FRB 20190520B). The energy distribution in this regime is unlikely to be adequately constrained until further events are detected. Modelling suggests that FAST may be well placed to discriminate between redshift evolutionary models and to probe the helium ionisation signal of the IGM.
