A method to determine the evolution history of the mean neutral Hydrogen fraction

被引：20

作者：

Mondal, Rajesh ^{[1
]}

Bharadwaj, Somnath ^{[2
,3
]}

Iliev, Ilian T. ^{[1
]}

Datta, Kanan K. ^{[4
]}

Majumdar, Suman ^{[5
,6
]}

Shaw, Abinash K. ^{[2
,3
]}

Sarkar, Anjan K. ^{[2
,3
]}

机构：

[1] Univ Sussex, Dept Phys & Astron, Astron Ctr, Brighton BN1 9QH, E Sussex, England

[2] Indian Inst Technol Kharagpur, Dept Phys, Kharagpur 721302, W Bengal, India

[3] Indian Inst Technol Kharagpur, Ctr Theoret Studies, Kharagpur 721302, W Bengal, India

[4] Presidency Univ, Dept Phys, 86-1 Coll St, Kolkata 700073, W Bengal, India

[5] Indian Inst Technol Indore, Ctr Astron, Indore 453552, Madhya Pradesh, India

[6] Imperial Coll, Blackett Lab, Dept Phys, London SW7 2AZ, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2019年 / 483卷 / 01期

基金：

英国科学技术设施理事会;

关键词：

methods: statistical; dark ages; reionization; first stars; diffuse radiation; large-scale structure of Universe; cosmology: theory; observations; REIONIZATION 21-CM SIGNAL; LIGHT-CONE ANISOTROPY; POWER-SPECTRUM; HI DISTRIBUTION; NON-GAUSSIANITY; EPOCH; FLUCTUATIONS; STATISTICS; II;

D O I：

10.1093/mnrasl/sly226

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The light-cone ( LC) effect imprints the cosmological evolution of the redshifted 21-cm signal T-b((n) over cap,nu) along the frequency axis that is the line-of-sight ( LoS) direction of an observer. The effect is particularly pronounced during the epoch of reionization ( EoR) when the mean hydrogen neutral fraction (x) over bar (HI)(nu) falls rapidly as the universe evolves. The multifrequency angular power spectrum C-l(nu(1),nu(2)) quantifies the entire second-order statistics of T-b((rho) over cap,nu) considering both the systematic variation along. due to the cosmological evolution and also the statistically homogeneous and isotropic fluctuations along all the three spatial directions encoded in (n) over cap and nu. Here, we propose a simple model where the systematic frequency (nu(1), nu(2)) dependence of C-l(nu(1),nu(2)) arises entirely due to the evolution of (x) over cap (HI)(nu). This provides a new method to observationally determine the reionization history. Considering an LC simulation of the EoR 21-cm signal, we use the diagonal elements nu(1) = nu(2) of C-l(nu(1), nu(2)) to validate our model. We demonstrate that it is possible to recover the reionization history across the entire observational bandwidth provided we have the value (x) over cap (HI) at a single frequency as an external input.

引用

页码：L109 / L113

页数：5

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