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- W2775286001 abstract "Modelling the distribution of neutral hydrogen (H i) in dark matter haloes is important for studying galaxy evolution in the cosmological context. We use a novel approach to infer the H i-dark matter connection at the massive end (|$m_{rm{H small I}} >10^{9.8}rm M_{odot }$|) from radio H i 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 H i content using a statistical scaling relation between the optical properties and H i mass. This allows us to compute the abundance and clustering properties of H i-selected galaxies and compare with data from the ALFALFA survey. We apply an Markov chain Monte Carlo-based statistical analysis to constrain the free parameters related to the scaling relation. The resulting best-fit scaling relation identifies massive H i galaxies primarily with optically faint blue centrals, consistent with expectations from galaxy formation models. We compare the H i-stellar mass relation predicted by our model with independent observations from matched H i-optical galaxy samples, finding reasonable agreement. As a further application, we make some preliminary forecasts for future observations of H i and optical galaxies in the expected overlap volume of SKA and Euclid/LSST." @default.
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- W2775286001 date "2018-06-11" @default.
- W2775286001 modified "2023-10-01" @default.
- W2775286001 title "Halo models of H i selected galaxies" @default.
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- W2775286001 doi "https://doi.org/10.1093/mnras/sty1539" @default.
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