Modelling the post-reionization neutral Hydrogen (\HI) bias

Debanjan Sarkar; Somnath Bharadwaj; Anathpindika S.

doi:10.1093/mnras/stw1111

paper

Modelling the post-reionization neutral Hydrogen (\HI) bias

arXiv:1605.02963 · doi:10.1093/mnras/stw1111

Abstract

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 ( $z \leq 6$ ). 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 $1 \leq z \leq 6$ . We have modelled the \HI bias as a complex quantity $b ~ (k, z)$ whose modulus squared $b^{2} (k, z)$ relates $P_{\HI}(k,z)$ to the matter power spectrum $P (k, z)$ , and whose real part $b_{r} (k, z)$ 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 $0 \leq z \leq 6$ and $0.01 \leq k \leq 10 Mpc^{- 1}$ . We also present results for the stochasticity $r = b_{r} / b$ which is important for cross-correlation studies.

arXiv comment11 pages, 7 figures, accepted for publication in MNRAS main journal

Modelling the post-reionization neutral Hydrogen (\HI) bias

Abstract

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