标题： 提高再电离时代的21厘米发射统计观测中的前景减除 显示英文标题

标题： Improving Foreground Subtraction in Statistical Observations of 21 cm Emission from the Epoch of Reionization

摘要： 利用中性氢的21厘米谱线对再电离纪元的统计观测有可能彻底改变我们对结构形成和首批发光天体的理解。然而，这些观测受到一系列强烈前景源的复杂化。文献中已经提出了几种前景去除技术，并假设这些技术会结合使用以揭示再电离（EOR）信号。 通过研究所提出的前景去除技术的特征减除误差，我们确定了另一个额外的减除阶段，可以进一步减少EOR前景污染，并研究前景去除算法之间的相互作用。这使我们能够概述一个综合的前景去除策略，整合所有先前提出的减除技术。 利用这个前景去除框架和特征减除误差，我们讨论了不同前景去除技术的互补性以及对阵列设计和EOR数据分析的影响。 显示英文摘要

摘要： Statistical observations of the Epoch of Reionization using the 21 cm line of neutral hydrogen have the potential to revolutionize our understanding of structure formation and the first luminous objects. However, these observations are complicated by a host of strong foreground sources. Several foreground removal techniques have been proposed in the literature, and it has been assumed that these would be used in combination to reveal the Epoch of Reionization (EOR) signal. By studying the characteristic subtraction errors of the proposed foreground removal techniques, we identify an additional subtraction stage that can further reduce the EOR foreground contamination, and study the interactions between the foreground removal algorithms. This enables us to outline a comprehensive foreground removal strategy that incorporates all previously proposed subtraction techniques. Using this foreground removal framework and the characteristic subtraction errors, we discuss the complementarity of different foreground removal techniques and the implications for array design and the analysis of EOR data.