The statistics of negative power spectrum systematics in some 21 cm analyses

The statistics of negative power spectrum systematics in some 21 cm analyses
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一些21cm分析中负功率谱系统学的统计

DOI:
10.1093/mnras/stad2357
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发表时间:
2023
影响因子:
4.8
通讯作者:
Hazelton, Bryna J.
Hazelton, Bryna J.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Morales, Miguel F.;Pober, Jonathan;Hazelton, Bryna J.

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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厘米宇宙学团体认为任何观测系统学都会增加力量,因为负PS是非物理的。除了它们的起源之谜之外,负PS系统学还提出了人为降低21 cm PS上限的幽灵。看来,来源的负PS系统是一个微妙的选择之间的相互作用,在如何PS估计计算和基线依赖的系统功率。本文提出了一个基线依赖系统学的统计模型,以探讨负PS系统学如何出现及其统计特征。这导致我们的建议,何时以及如何考虑负PS系统学时,报告观测21厘米宇宙学上限。
Through a very careful analysis Kolopanis and collaborators identified anegativepower 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.
DOI: 10.1093/mnras/stad845
发表时间: 2022-10
影响因子: 4.8
作者:
M. Kolopanis;J. Pober;D. Jacobs;Samantha McGraw
通讯作者: M. Kolopanis;J. Pober;D. Jacobs;Samantha McGraw
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