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We present a simulation of the cosmic evolution of the atomic and molecularphases of the cold hydrogen gas in about 3e7 galaxies, obtained bypost-processing the virtual galaxy catalog produced by (De Lucia et al. 2007)on the Millennium Simulation of cosmic structure (Springel et al. 2005). Ourmethod uses a set of physical prescriptions to assign neutral atomic hydrogen(HI) and molecular hydrogen (H2) to galaxies, based on their total cold gasmasses and a few additional galaxy properties. These prescriptions arespecially designed for large cosmological simulations, where, given currentcomputational limitations, individual galaxies can only be represented bysimplistic model-objects with a few global properties. Our recipes allow us to(i) split total cold gas masses between HI, H2, and Helium, (ii) assignrealistic sizes to both the HI- and H2-disks, and (iii) evaluate thecorresponding velocity profiles and shapes of the characteristic radio emissionlines. The results presented in this paper include the local HI- and H2-massfunctions, the CO-luminosity function, the cold gas mass--diameter relation,and the Tully-Fisher relation (TFR), which all match recent observational datafrom the local Universe. We also present high-redshift predictions of cold gasdiameters and the TFR, both of which appear to evolve markedly with redshift.

Simulation of the Cosmic Evolution of Atomic and Molecular Hydrogen in Galaxies