Modelling the cosmic neutral hydrogen from DLAs and 21 cm observations

Abstract

We review the analytical prescriptions in the literature to model the 21-cm (emission line surveys/intensity mapping experiments) and Damped Lyman-Alpha (DLA) observations of neutral hydrogen (HI) in the post-reionization universe. While these two sets of prescriptions have typically been applied separately for the two probes, we attempt to connect these approaches to explore the consequences for the distribution and evolution of HI across redshifts. We find that a physically motivated, 21-cm based prescription, extended to account for the DLA observables provides a good fit to the majority of the available data, but cannot accommodate the recent measurement of the clustering of DLAs at $z\sim 2.3$. This highlights a tension between the DLA bias and the 21-cm measurements, unless there is a very significant change in the nature of HI-bearing systems across redshifts 0-3. We discuss the implications of our findings for the characteristic host halo masses of the DLAs and the power spectrum of 21-cm intensity fluctuations.

8 pages, 5 figures, 1 table; version accepted for publication in MNRAS

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Cited by in corpus (28)

• Ingredients for 21cm intensity mapping
• Galaxy formation in the Planck Millennium: the atomic hydrogen content of dark matter halos
• HI constraints from the cross-correlation of eBOSS galaxies and Green Bank Telescope intensity maps
• A halo model for cosmological neutral hydrogen: abundances and clustering
• On the spatial distribution of neutral hydrogen in the Universe: bias and shot-noise of the HI Power Spectrum
• Baryonic acoustic oscillations from 21cm intensity mapping: the Square Kilometre Array case
• The SDSS-DR12 large-scale cross-correlation of Damped Lyman Alpha Systems with the Lyman Alpha Forest
• Intensity Mapping as a Probe of Axion Dark Matter
• Constraining a halo model for cosmological neutral hydrogen
• LyaCoLoRe: Synthetic Datasets for Current and Future Lyman-$\alpha$ Forest BAO Surveys
• Constraints on the evolution of the relationship between HI mass and halo mass in the last 12 Gyr
• HInet: Generating neutral hydrogen from dark matter with neural networks
• Impact of astrophysics on cosmology forecasts for 21 cm surveys
• Connecting cosmological accretion to strong Lyman-alpha absorbers
• A scale dependent bias on linear scales: the case for HI intensity mapping at z=1
• Tracing the cosmological evolution of stars and cold gas with CMB spectral surveys
• Halo models of HI selected galaxies
• The Cosmological Bias Factor of Damped Lyman Alpha systems: Dependence on Metal Line Strength
• The Breakdown Scale of HI Bias Linearity
• HIR4: cosmology from a simulated neutral hydrogen full sky using Horizon Run 4
• On the accuracy of common moment-based radiative transfer methods for simulating reionization
• Modeling assembly bias with machine learning and symbolic regression
• Synergies across the spectrum for particle dark matter indirect detection: how HI intensity mapping meets gamma rays
• HIR4: Cosmological signatures imprinted on the cross correlation between 21-cm map and galaxy clustering
• Unveiling the Universe with Emerging Cosmological Probes
• A Multi-messenger view of Cosmic Dawn: Conquering the Final Frontier
• Neutral hydrogen in the post-reionization universe
• HI Intensity Mapping cross-correlation with thermal SZ fluctuations: forecasted cosmological parameters estimation for FAST and Planck