{
  "id": "1803.07692",
  "version": "v1",
  "published": "2018-03-20T23:32:29.000Z",
  "updated": "2018-03-20T23:32:29.000Z",
  "title": "The $HI$- and $H_{2}$-to-stellar mass correlations of late- and early-type galaxies and their consistency with the observational mass functions",
  "authors": [
    "A. R. Calette",
    "Vladimir Avila-Reese",
    "Aldo Rodríguez-Puebla",
    "Héctor Hernández-Toledo",
    "Emmanouil Papastergis"
  ],
  "comment": "42 pages, 18 figures, submitted to RMxAA, after referee report",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We compile from the literature many local galaxy samples (mostly from follow-up radio observations of optically-selected samples) with available information on stellar mass, morphology, and HI and/or $H_{2}$ gas content. After homogenizing the data and handling adequately the reported upper limits in the case of non gas detections, we determine the $HI$- and $H_{2}$-to-stellar mass correlations (mean and standard deviation) of galaxies separated into two main populations, late- and early-type galaxies (LTGs and ETGs, respectively). The correlations are described by either a single or double power law, but at the low-mass side, some hints of flattening are found, with transition masses close to the one that separates normal and dwarf galaxies, $M_{\\ast}\\approx 1-2\\times 10^{9}M_{\\odot}$. LTGs are significantly gas richer than ETGs, specially at the highest masses. The respective $H_{2}$-to-$HI$ mass ratios as a function of $M_{\\ast}$ are presented. Further, we attempt to constrain the corresponding full distributions of the $HI$- and $H_{2}$-to-stellar mass ratios as a function of $M_{\\ast}$ for both LTGs and ETGs. A Schechter function for the former and a (broken) Schechter + uniform function for the latter, with the function parameters depending on $M_{\\ast}$, provide reasonable descriptions of the data (detections and non detections). By using the observed galaxy stellar mass function and volume-complete fractions of LTGs/ETGs as a function of $M_{\\ast}$, these empirical distributions are mapped into $HI$ and $H_{2}$ mass functions. The obtained total $HI$ and $H_{2}$ mass functions are in reasonable agreement with those inferred from observations. The empirical gas-to-stellar mass correlations and distributions for local LTGs and ETGs presented here can be used to constrain models and simulations of galaxy evolution.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-03-20T23:32:29.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "observational mass functions",
      "early-type galaxies",
      "consistency",
      "mass ratios",
      "galaxy stellar mass function"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 42,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}