Halo models of HI selected galaxies

Abstract

Modelling the distribution of neutral hydrogen (HI) in dark matter halos is important for studying galaxy evolution in the cosmological context. We use a novel approach to infer the HI-dark matter connection at the massive end ($m_{\mathrm{HI}}>10^{9.8}{M}_{\odot }$) from radio HI emission surveys, using optical properties of low-redshift galaxies as an intermediary. In particular, we use a previously calibrated optical HOD describing the luminosity- and colour-dependent clustering of SDSS galaxies and describe the HI content using a statistical scaling relation between the optical properties and HI mass. This allows us to compute the abundance and clustering properties of HI-selected galaxies and compare with data from the ALFALFA survey. We apply an MCMC-based statistical analysis to constrain the free parameters related to the scaling relation. The resulting best-fit scaling relation identifies massive HI galaxies primarily with optically faint blue centrals, consistent with expectations from galaxy formation models. We compare the HI-stellar mass relation predicted by our model with independent observations from matched HI-optical galaxy samples, finding reasonable agreement. As a further application, we make some preliminary forecasts for future observations of HI and optical galaxies in the expected overlap volume of SKA and Euclid/LSST.

12 pages, 11 figures, v2: substantial revision, matches accepted version

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Cited by in corpus (17)

• 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
• Direct Measurement of the HI-Halo Mass Relation through Stacking
• Intensity mapping cross-correlations II: HI halo models including shot noise
• The radial acceleration relation in a $\Lambda$CDM universe
• Conditional HI mass functions and the HI-to-halo mass relation in the local Universe
• ARTIST: Fast radiative transfer for large-scale simulations of the epoch of reionisation
• The BINGO Project VI: HI Halo Occupation Distribution and Mock Building
• Multi-wavelength mock galaxy catalogs of the low-redshift Universe
• The galaxy HI-(sub)halo connection and the HI spatial clustering of local galaxies
• The HI-halo mass relation at redshift $z\sim 1$ from the Minkowski functionals of 21 cm intensity maps
• The Tiered Radio Extragalactic Continuum (T-RECS) simulation II: HI emission and continuum-HI cross-correlation
• Global analysis of luminosity- and colour-dependent galaxy clustering in the Sloan Digital Sky Survey
• The phenomenology of the external field effect in cold dark matter models
• The Population of Galaxies that Contribute to The HI Mass Function
• The Dark Matter Halos of HI Selected Galaxies
• HI HOD -- I. The Halo Occupation Distribution of HI Galaxies