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Lagos, Garima Chauhan, Lister Staveley-Smith, Luca Cortese, Tom Oosterloo, Wenkai Hu, Xuelei Chen","submitted_at":"2020-01-24T16:18:12Z","abstract_excerpt":"We use spectral stacking to measure the contribution of galaxies of different masses and in different hierarchies to the cosmic atomic hydrogen (HI) mass density in the local Universe. Our sample includes 1793 galaxies at $z < 0.11$ observed with the Westerbork Synthesis Radio Telescope, for which Sloan Digital Sky Survey spectroscopy and hierarchy information are also available. We find a cosmic HI mass density of $\\Omega_{\\rm HI} = (3.99 \\pm 0.54)\\times 10^{-4} h_{70}^{-1}$ at $\\langle z\\rangle = 0.065$. 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