Theoretical and observational constraints on the HI intensity power spectrum

Abstract

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, ${\Omega }_{\mathrm{HI}}$ and bias parameter, $b_{\mathrm{HI}}$ are key astrophysical inputs to the HI intensity fluctuation power spectrum. We compile the latest theoretical and observational constraints on ${\Omega }_{\mathrm{HI}}$ and $b_{\mathrm{HI}}$ 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 halos, 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 ${\Omega }_{\mathrm{HI}}$, $b_{\mathrm{HI}}$ 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.

12 pages, 8 figures, 4 tables; version accepted for publication in MNRAS

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• First multi-redshift limits on post-Epoch of Reionization (post-EoR) 21 cm signal from z = 1.96 - 3.58 using uGMRT
• Simulated foreground predictions for HI at z = 3.35 with the Ooty Wide Field Array: I. Instrument and the foregrounds
• Post-reionization HI 21-cm signal: A probe of negative cosmological constant
• Towards $21$-cm intensity mapping at $z=2.28$ with uGMRT using the tapered gridded estimator III: Foreground removal
• Towards $21$-cm intensity mapping at $z=2.28$ with uGMRT using the tapered gridded estimator II: Cross-polarization power spectrum
• Simulating the z = 3.35 HI 21-cm visibility signal for the Ooty Wide Field Array(OWFA)
• A Multi-messenger view of Cosmic Dawn: Conquering the Final Frontier
• Probing Quintessence using BAO imprint on the cross-correlation of weak lensing and post-reionization HI 21 cm signal
• Prospects of detecting HI using redshifted 21 cm radiation at z ~ 3
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• The BINGO project X. Cosmological parameter constraints from HI Intensity Mapping lognormal simulations
• Probing dark energy using anisotropies in the clustering of post-EoR HI distribution