{
  "id": "2410.19340",
  "version": "v1",
  "published": "2024-10-25T06:55:07.000Z",
  "updated": "2024-10-25T06:55:07.000Z",
  "title": "NeutralUniverseMachine: Predictions of HI gas in Different Theoretical Models",
  "authors": [
    "Lingkun Wen",
    "Hong Guo",
    "Wenlin Ma",
    "Lizhi Xie",
    "Gabriella De Lucia",
    "Fabio Fontanot",
    "Michaela Hirschmann"
  ],
  "comment": "12 pages, 9 figures, submitted to A&A",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We investigate the distribution and evolution of HI gas in different theoretical models, including hydro-dynamical simulations (Illustris-TNG and SIMBA), semi-analytic models (GAEA), and the empirical models ( NeutralUniverseMachine; NUM). By comparing model predictions for the HI mass function (HIMF), HI-halo and HI-stellar mass relations, conditional HI mass function (CHIMF) and the halo occupation distribution (HOD) of HI-selected galaxies, we find that all models show reasonable agreement with the observed HIMF at $z\\sim0$, but the differences become much larger at higher redshifts of $z=1$ and $z=2$. The HIMF of NUM shows remarkable agreement with the observation at $z=1$, whereas other models predict much lower amplitudes of HIMF at the high-mass end. Comparisons of CHIMF distributions indicate that the HIMF is dominated by halos of $10< \\log(M_{\\rm vir}/M_\\odot) <11$ and $11< \\log(M_{\\rm vir}/M_\\odot)<12$ at the low- and high-mass ends, respectively. From the HI HODs of central galaxies, we find that TNG100 overpredicts the number of central galaxies with high $M_{\\rm HI}$ in massive halos and GAEA shows a very strong depletion of HI gas in quenched centrals of massive halos. The main cause of the differences is the AGN feedback mechanisms implemented in different models.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2024-10-25T06:55:07.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "hi gas",
      "theoretical models",
      "predictions",
      "neutraluniversemachine",
      "central galaxies"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 12,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}