论文标题
从Illustristng模拟及其宇宙应用估算的快速无线电爆发的层间介质色散度量
Intergalactic medium dispersion measures of fast radio bursts estimated from IllustrisTNG simulation and their cosmological applications
论文作者
论文摘要
快速无线电爆发（FRB）是毫秒的无线电瞬变，可以用作宇宙学探针。然而，很难与其他成分区分开，由乳乳间培养基（IGM）贡献的色散度量（DM）。在本文中，我们使用Illustristng模拟实际估计$ dm _ {\ rm Igm} $最高$ z \ sim 9 $。我们发现$ dm _ {\ rm igm} = 892^{+721} _ { - 270} $ pc cm $^{ - 3} $ at $ z = 1 $。 $ dm _ {\ rm igm} $的概率分布可以通过带有长尾巴的准高斯功能很好地安装。尾巴是由IgM中视线沿线的结构引起的。 $ dm _ {\ rm igm} $从银河系中减去DM贡献，并为本地化FRB的主机Galaxy贡献，接近派生的$ dm _ {\ rm Igm} -z $ Relation。我们还展示了使用Illustristng Universe中高红色shift FRB的$ dm _ {\ rm igm} $限制宇宙回离历史的能力。高红移的衍生$ dm _ {\ rm igm} -z $关系可以通过$ tanh $ repionization模型很好地安装，而Revienization Redshift $ z = 5.95 $，这与IllustristNG Simulation使用的re次接收模型兼容。 $ dm _ {\ rm igm} $ of High Redshift FRB还提供了一种测量宇宙微波背景（CMB）光学深度的独立方法。我们的结果可用于以$ dm _ {\ rm Igm} <4000 $ \ \ \ pc cm $^{ - 3} $来得出非定位FRB的伪降低。
Fast radio bursts (FRBs) are millisecond-duration radio transients and can be used as a cosmological probe. However, the dispersion measure (DM) contributed by intergalactic medium (IGM) is hard to be distinguished from other components. In this paper, we use the IllustrisTNG simulation to realistically estimate the $DM_{\rm IGM}$ up to $z\sim 9$. We find $DM_{\rm IGM} = 892^{+721}_{-270}$ pc cm$^{-3}$ at $z=1$. The probability distribution of $DM_{\rm IGM}$ can be well fitted by a quasi-Gaussian function with a long tail. The tail is caused by the structures along the line of sight in IGM. Subtracting DM contributions from the Milky Way and host galaxy for localized FRBs, the $DM_{\rm IGM}$ value is close to the derived $DM_{\rm IGM}-z$ relation. We also show the capability to constrain the cosmic reionization history with the $DM_{\rm IGM}$ of high-redshift FRBs in the IllustrisTNG universe. The derived $DM_{\rm IGM}-z$ relation at high redshifts can be well fitted by a $tanh$ reionization model with the reionization redshift $z=5.95$, which is compatible with the reionization model used by the IllustrisTNG simulation. The $DM_{\rm IGM}$ of high-redshift FRBs also provides an independent way to measure the optical depth of cosmic microwave background (CMB). Our result can be used to derive the pseudo-redshifts of non-localized FRBs for $DM_{\rm IGM}<4000$ \ \ pc cm$^{-3}$.
