The statistics of negative power spectrum systematics in some 21 cm analyses
The statistics of negative power spectrum systematics in some 21 cm analyses
复制标题
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.
中科院分区:
文献类型:
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作者:
Morales, Miguel F.;Pober, Jonathan;Hazelton, Bryna J.
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.
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
DOI:
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发表时间:
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期刊:
影响因子:
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