论文标题

通过Lyman-$α$发射器的空隙概率函数探测斑驳的电源

Probing Patchy Reionization with the Void Probability Function of Lyman-$α$ Emitters

论文作者

Perez, Lucia A., Malhotra, Sangeeta, Rhoads, James E., Laursen, Peter, Wold, Isak G. B.

论文摘要

我们探测了全局电离氢分子的约束,空隙概率函数(VPF)聚类可以在电离时期(lager)窄带调查时期为Lyman-Alpha星系提供作为区域的函数。中性氢的作用像是用于Lyman-Alpha发射的雾,并测量了Lyman-$α$发射器(LAES)的发光函数下降来限制窄带调查中的电离分数。但是,LAE的聚类与光度函数的固有演变无关,并且可以在不同模型下提供其他限制。 VPF测量给定圆的可能为空的可能性。这是一个具有体积平均的聚类统计量,可追溯到高阶相关性的行为,其简单性为计划调查提供了有用的框架。 Using the \citet{Jensen2014} simulations of LAEs within various amount of ionized intergalactic medium, we predict the behavior of the VPF in one (301x150.5x30 Mpc$^3$), four (5.44$\times 10^6$ Mpc$^3$), or eight (1.1$\times 10^7$ Mpc$^3$) fields of LAGER imaging.我们检查了VPF在5和13弧形时的VPF,对应于LAE密度和2D VPF与随机的最小比例,以及从随机的最大尺度,以及从8范围的15.5度$^2 $ lager区域中的最大尺度。我们发现,即使是一个啤酒的单个DECAM字段(2-3 v $^2 $)也可以区分主要中性与电离。此外,我们发现四个领域允许在30%,50%和95%的电离之间进行区分。而且,八个领域甚至可以区分30%,50%,73%和95%的电离。

We probe what constraints for the global ionized hydrogen fraction the Void Probability Function (VPF) clustering can give for the Lyman-Alpha Galaxies in the Epoch of Reionization (LAGER) narrowband survey as a function of area. Neutral hydrogen acts like a fog for Lyman-alpha emission, and measuring the drop in the luminosity function of Lyman-$α$ emitters (LAEs) has been used to constrain the ionization fraction in narrowband surveys. However, the clustering of LAEs is independent from the luminosity function's inherent evolution, and can offer additional constraints for reionization under different models. The VPF measures how likely a given circle is to be empty. It is a volume-averaged clustering statistic that traces the behavior of higher order correlations, and its simplicity offers helpful frameworks for planning surveys. Using the \citet{Jensen2014} simulations of LAEs within various amount of ionized intergalactic medium, we predict the behavior of the VPF in one (301x150.5x30 Mpc$^3$), four (5.44$\times 10^6$ Mpc$^3$), or eight (1.1$\times 10^7$ Mpc$^3$) fields of LAGER imaging. We examine the VPF at 5 and 13 arcminutes, corresponding to the minimum scale implied by the LAE density and the separation of the 2D VPF from random, and the maximum scale from the 8-field 15.5 deg$^2$ LAGER area. We find that even a single DECam field of LAGER (2-3 deg$^2$) could discriminate between mostly neutral vs. ionized. Additionally, we find four fields allows the distinction between 30, 50, and 95 percent ionized; and that eight fields could even distinguish between 30, 50, 73, and 95 percent ionized.

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