论文标题
通过分散度量快速无线电爆发来重建电源历史
Reconstruction of Reionization History through Dispersion Measure of Fast Radio Bursts
论文作者
论文摘要
在本文中，我们通过使用快速无线电爆发（FRB）的分散测量值（DMS）来研究电离时期电离分数$ x_e（z）$的演变。与以前的研究不同，我们转向考虑FRB目录的观察到的DMS的大规模聚类信息，FRB目录的DMS只需要粗糙的红移分布，而不是每个FRB的确切红移信息。首先，我们考虑$ x_e（z）$的瞬时``\ texttt {tanh}''模型，并找到包括模拟目录的自动相关信息，大约$ 10^4 $ frb，具有固有的dm散布100 $ \ rm pc/cm cm^$ span $ spand $ sky的nsky $ sky的内在dm散布，可以改善所有天空的范围。与仅在CMB数据中进行比较时。电离分数的进化形状将被紧密地缩小，即缩减电离时代的持续时间，$ z _ {\ rm dur} <2.24 $（95 \％c.l.）。此外，我们还使用了另一个红移 - 对称的重离模型，并获得了FRB模拟目录可以在$ z = 6 $的情况下测量电离分数，而$1σ$误差$Δx_e（z = 6）= 0.012 $，这意味着frb catalog catalion的大规模聚集信息非常敏感。我们得出的结论是，对高红移FRB的观察可能是研究未来电离历史的互补探针。
In this paper, we study the evolution of the ionization fraction $x_e(z)$ during the epoch of reionization by using the dispersion measurements (DMs) of fast radio bursts (FRBs). Different from the previous studies, here we turn to consider the large-scale clustering information of observed DMs of FRB catalog, which only needs the rough redshift distribution, instead of the exact redshift information of each FRB. Firstly, we consider the instantaneous ``\texttt{tanh}'' model for $x_e(z)$ and find that including the auto-correlation information of the mock catalog, about $10^4$ FRBs with the intrinsic DM scatter of 100 $\rm pc/cm^3$ spanning 20\% of all sky, could significantly improve the constraint on the width $Δ_z$ of the model, when comparing with that from the CMB data alone. The evolution shape of the ionization fraction will be tightly narrowed, namely the duration of the epoch of reionization has been shrunk, $z_{\rm dur}<2.24$ (95\% C.L.). Furthermore, we also use another redshift-asymmetric reionization model and obtain that the FRB mock catalog could measure the ionization fraction at $z=6$ precisely with the $1σ$ error $Δx_e(z=6)=0.012$, which means that the large-scale clustering information of observed DMs of FRB catalog is very sensitive to the ionization fraction of the end of reionization epoch. We conclude that the observation of high-redshift FRBs could be a complementary probe to study the reionization history in the future.
