The Astrophysics of Hydrogen and Helium Reionization

该研究计划将研究宇宙在氢和氦中的再电离，结合分析和数值方法来阐明再电离的物理基础，以及它如何受到电离源的性质和丰度以及星系际介质（IGM）特性的影响。 分析将进一步考虑再电离对这一过程的可观测特征的影响，包括在高红移的氢21厘米辐射的波动，Ly-alpha发射星系的调查，γ射线爆发的光谱，以及莱曼-α森林的统计特性。这项调查的结果将被用来指导最佳的观测策略，为正在进行的和未来的实验，以调查从高红移星系，类星体和扩散气体的IGM.The更广泛的影响，这项工作包括培训代表性不足的学生，并通过可视化和通过网络访问的模拟公众宣传。

This research program will examine the reionization of the Universe in both hydrogen and helium, combining analytical and numerical approaches to elucidate the physics underlying reionization and how it is influenced by the nature and abundance of the ionizing sources and the properties of the intergalactic medium (IGM). The analysis will be further employed to consider the impact of reionization on observable signatures of this process, including fluctuations in 21 cm radiation from hydrogen at high redshifts, surveys of Ly-alpha emitting galaxies, spectra of gamma-ray bursts, and the statistical properties of the Lyman-alpha forest. The results of this investigation will be used to guide optimal observing strategies for ongoing and future experiments to investigate emission from high-redshift galaxies, quasars, and diffuse gas in the IGM.The broader impacts of this work include training of underrepresented students, and public outreach through visualizations and simulations accessible through the web.