Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 460, Issue 4, Pages 4310-4319Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw1111
Keywords
methods: statistical; cosmology: theory; diffuse radiation; large scale structure of Universe
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Funding
- SERB, Department of Science & Technology, Government of India [YSS/2014/000304]
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Observations of the neutral Hydrogen (\HI ) 21-cm signal hold the potential of allowing us to map out the cosmological large scale structures (LSS) across the entire post-reionization era (z=6). Several experiments are planned to map the LSS over a large range of redshifts and angular scales, many of these targeting the Baryon Acoustic Oscillations. It is important to model the \HI distribution in order to correctly predict the expected signal, and more so to correctly interpret the results after the signal is detected. In this paper we have carried out semi-numerical simulations to model the \HI distribution and study the \HI power spectrum $P_{\HI}(k,z)$ across the redshift range 1=z=6. We have modelled the \HI bias as a complex quantity b similar to(k,z) whose modulus squared b2(k,z) relates $P_{\HI}(k,z)$ to the matter power spectrum P(k,z), and whose real part br(k,z) quantifies the cross-correlation between the \HI and the matter distribution. We study the z and k dependence of the bias, and present polynomial fits which can be used to predict the bias across 0=z=6 and 0.01=k=10Mpc-1. We also present results for the stochasticity r=br/b which is important for cross-correlation studies.
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