Sarkar, Debanjan ; Bharadwaj, Somnath ; Anathpindika, S. (2016) Modelling the post-reionization neutral hydrogen (H i ) bias Monthly Notices of the Royal Astronomical Society, 460 (4). pp. 4310-4319. ISSN 0035-8711
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Official URL: http://doi.org/10.1093/mnras/stw1111
Related URL: http://dx.doi.org/10.1093/mnras/stw1111
Abstract
Observations of the neutral hydrogen (H I ) 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 H I 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 H I distribution and study the H I power spectrum PHI(k,z) across the redshift range 1 ≤ z ≤ 6. We have modelled the H I bias as a complex quantity b~(k,z) whose modulus squared b2(k, z) relates PHI(k,z) to the matter power spectrum P(k, z), and whose real part br(k, z) quantifies the cross-correlation between the H I 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 ≤ 10 Mpc−1. We also present results for the stochasticity r = br/b which is important for cross-correlation studies.
Item Type: | Article |
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Source: | Copyright of this article belongs to The Royal Astronomical Society. |
Keywords: | Methods: Statistical; Cosmology: Theory; Diffuse Radiation; Large Scale Structure Of Universe. |
ID Code: | 116320 |
Deposited On: | 09 Apr 2021 04:30 |
Last Modified: | 09 Apr 2021 04:30 |
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