标题： 氢再电离期间的中性区域统计学 显示英文标题

标题： Statistics of Neutral Regions During Hydrogen Re-Ionization

摘要： 我们提出了两个关于高红移氢再电离过程的统计量的预测。 第一个统计量是在高红移类星体光谱中识别出的中性段的数量，作为其长度的函数。 第二个是中性区域与可能的电离辐射源之间的交叉相关性。 这些独立探针对电离区域的拓扑结构敏感。 如果再电离从高密度到低密度区域进行，则交叉相关性将为负值；而如果空洞首先被电离，则我们预计会有正相关性和相对较少的长中性段。 我们测试了这些统计量对高红移星系中恒星再电离的敏感性。 通过在N体模拟中使用半解析星系形成模型来识别星系，估计了来自恒星的电离辐射通量。 在各种电离锋传播模型中追踪了电离气体的空间分布。 一个电离从高密度到低密度区域进行的模型与Becker等人（2001）的观测结果一致，而在最低密度区域开始电离的模型似乎与目前的数据不一致。 显示英文摘要

摘要： We present predictions for two statistical measures of the hydrogen reionization process at high redshift. The first statistic is the number of neutral segments identified in spectra of high redshift QSOs as a function of their length. The second is the cross-correlation of neutral regions with possible sources of ionizing radiation. These independent probes are sensitive to the topology of the ionized regions. If reionization proceeded from high to low density regions then the cross-correlation will be negative, while if voids were ionized first then we expect a positive correlation and a relatively small number of long neutral segments. We test the sensitivity of these statistics for reionization by stars in high redshift galaxies. The flux of ionizing radiation emitted from stars is estimated by identifying galaxies in an N-body simulation using a semi-analytic galaxy formation model. The spatial distribution of ionized gas is traced in various models for the propagation of the ionization fronts. A model with ionization proceeding from high to low density regions is consistent with the observations of Becker et al. (2001), while models in which ionization begins in the lowest density regions appear to be inconsistent with the present data.