Theoretical and observational constraints on the HI intensity power spectrum

被引：49

作者：

Padmanabhan, Hamsa ^{[1
]}

Choudhury, T. Roy ^{[2
]}

Refregier, Alexandre ^{[3
]}

机构：

[1] Interuniv Ctr Astron & Astrophys, Pune 411007, Maharashtra, India

[2] Tata Inst Fundamental Res, Natl Ctr Radio Astrophys, Pune 411007, Maharashtra, India

[3] ETH, Inst Astron, CH-8093 Zurich, Switzerland

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2015年 / 447卷 / 04期

关键词：

cosmology: observations; cosmology: theory; large-scale structure of Universe; radio lines: galaxies; LY-ALPHA SYSTEMS; I MASS FUNCTION; ALL-SKY-SURVEY; 21-CM EMISSION; COSMOLOGICAL EVOLUTION; NEUTRAL HYDROGEN; LARGE REDSHIFTS; HIPASS CATALOG; TO; 0.1; GALAXIES;

D O I：

10.1093/mnras/stu2702

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Mapping of the neutral hydrogen (HI) 21-cm intensity fluctuations across redshifts promises a novel and powerful probe of cosmology. The neutral hydrogen gas mass density Omega(HI) and bias parameter b(HI) are key astrophysical inputs to the HI intensity fluctuation power spectrum. We compile the latest theoretical and observational constraints on Omega(HI) and b(HI) at various redshifts in the post-reionization universe. Constraints are incorporated from galaxy surveys, HI intensity mapping experiments, damped Lyman alpha system observations, theoretical prescriptions for assigning HI to dark matter haloes and the results of numerical simulations. Using a minimum variance interpolation scheme, we obtain the predicted uncertainties on the HI intensity fluctuation power spectrum across redshifts 0-3.5 for three different confidence scenarios. We provide a convenient tabular form for the interpolated values of Omega(HI), b(HI) and the HI power spectrum amplitude and their uncertainties. We discuss the consequences for the measurement of the power spectrum by current and future intensity mapping experiments.

引用

页码：3745 / 3755

页数：11

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