The H i intensity mapping bispectrum including observational effects
The H i intensity mapping bispectrum including observational effects
复制标题
H i 强度映射双谱，包括观察效应
DOI：
10.1093/mnras/stab2200
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发表时间：
2021
影响因子：
4.8
通讯作者：
Cunnington S
中科院分区：
文献类型：
--
作者：
Cunnington S
双谱是一种三点统计，有可能提供调查数据集功率谱分析以外的其他信息。射电望远镜广泛调查21厘米发射中性氢（Hi）是一种很有前途的方式来探测LSS，在这项工作中，我们提出了一个调查的Hiintensity映射（IM）双谱模拟。我们提出了一个模型的红移空间HiIM双谱，包括观测效果的射电望远镜光束和21厘米的前景污染。我们验证我们的建模处方与强大的IM模拟测量，包括这些观测效果。我们的前景模拟包括偏振泄漏，我们使用主成分分析清洗方法。我们还研究了非高斯光束的旁瓣效应。对于MeerKAT型单碟IM测量，在z = 0.39时，我们发现前景去除导致等边双谱的信噪比降低，而光束使其降低。我们发现我们的模型表现良好，通常提供，表明数据拟合良好。虽然我们的重点是后再电离，单碟IM，我们的观测效果，特别是前景去除建模，也可以相关的干涉仪和再电离研究。
The bispectrum is a three-point statistic with the potential to provide additional information beyond power spectra analyses of survey data sets. Radio telescopes that broadly survey the 21-cm emission from neutral hydrogen (Hi) are a promising way to probe LSS and in this work we present an investigation into the Hiintensity mapping (IM) bispectrum using simulations. We present a model of the redshift space HiIM bispectrum including observational effects from the radio telescope beam and 21-cm foreground contamination. We validate our modelling prescriptions with measurements from robust IM simulations, inclusive of these observational effects. Our foreground simulations include polarization leakage, on which we use a principal component analysis cleaning method. We also investigate the effects from a non-Gaussian beam including side-lobes. For a MeerKAT-like single-dish IM survey atz= 0.39, we find that foreground removal causes anreduction in the equilateral bispectrum’s signal-to-noise ratio, whereas the beam reduces it by. We find our models perform well, generally providing, indicating a good fit to the data. Whilst our focus is on post-reionization, single-dish IM, our modelling of observational effects, especially foreground removal, can also be relevant to interferometers and reionization studies.