论文标题
在大约21 cm分析中，负功率谱系的统计数据
The Statistics of Negative Power Spectrum Systematics in some 21 cm Analyses
论文作者
论文摘要
通过非常仔细的分析，Kolopanis和合作者确定了负功率谱（PS）系统。 21 cm宇宙学界认为，任何观察性系统学都会增加功率，因为负PS是非物理的。除了其起源的奥秘外，负PS系统还增加了21厘米PS上人为降低上限的幽灵。看来，负PS系统的源是在如何计算PS估计值和基线依赖性系统功率方面的选择之间的微妙相互作用。在本文中，我们提出了一个基线依赖系统学的统计模型，以探讨负PS系统如何出现及其统计特征。这使我们提出有关在报告观察性21 cm宇宙学上限时何时以及如何考虑负面PS系统的建议。
Through a very careful analysis Kolopanis and collaborators identified a negative power spectrum (PS) systematic. The 21 cm cosmology community has assumed that any observational systematics would add power, as negative PS are non-physical. In addition to the mystery of their origin, negative PS systematics raise the spectre of artificially lowering upper limits on the 21 cm PS. It appears that the source of the negative PS systematics is a subtle interaction between choices in how the PS estimate is calculated and baseline-dependent systematic power. In this paper we present a statistical model of baseline dependent systematics to explore how negative PS systematics can appear and their statistical characteristics. This leads us to recommendations on when and how to consider negative PS systematics when reporting observational 21 cm cosmology upper limits.
