{
  "id": "2010.11958",
  "version": "v1",
  "published": "2020-10-22T18:00:03.000Z",
  "updated": "2020-10-22T18:00:03.000Z",
  "title": "The Cosmic Ultraviolet Baryon Survey (CUBS) II: Discovery of an H$_{2}$-Bearing DLA in the Vicinity of an Early-Type Galaxy at z = 0.576",
  "authors": [
    "Erin Boettcher",
    "Hsiao-Wen Chen",
    "Fakhri S. Zahedy",
    "Thomas J. Cooper",
    "Sean D. Johnson",
    "Gwen C. Rudie",
    "Mandy C. Chen",
    "Patrick Petitjean",
    "Sebastiano Cantalupo",
    "Kathy L. Cooksey",
    "Claude-André Faucher-Giguère",
    "Jenny E. Greene",
    "Sebastian Lopez",
    "John S. Mulchaey",
    "Steven V. Penton",
    "Mary E. Putman",
    "Marc Rafelski",
    "Michael Rauch",
    "Joop Schaye",
    "Robert A. Simcoe",
    "Gregory L. Walth"
  ],
  "comment": "19 pages, 6 figures. Resubmitted to ApJ",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We report the serendipitous detection of an H$_{2}$-bearing damped Lyman-$\\alpha$ absorber at z = 0.576 in the spectrum of the QSO J0111-0316 in the Cosmic Ultraviolet Baryon Survey. Spectroscopic observations from HST-COS in the far-ultraviolet reveal a damped absorber with log[N(HI)/cm^-2] = 20.10 (-0.21, +0.25) and log[N(H$_{2}$)/cm^-2] = 18.96 +/- 0.05. The diffuse molecular gas is found in two velocity components separated by dv = 60 km/s, with >99.9% of the total H$_{2}$ column density concentrated in one component. At a metallicity of $\\approx$ 40% of solar, there is evidence for Fe enhancement and dust depletion, with a dust-to-gas ratio $\\kappa_{\\text{O}} \\approx$ 0.4. A galaxy redshift survey conducted with IMACS and LDSS-3C on Magellan reveals an overdensity of nine galaxies at projected distance d <= 600 proper kpc (pkpc) and line-of-sight velocity offset dv$_{g}$ <= 300 km/s from the absorber. The closest is a massive, early-type galaxy at d = 41 pkpc which contains 70% of the total stellar mass identified at d <= 310 pkpc of the H$_{2}$ absorber. The close proximity of the H$_{2}$-bearing gas to the quiescent galaxy and the Fe-enhanced chemical abundance pattern of the absorber suggest a physical connection, in contrast to a picture in which DLAs are primarily associated with gas-rich dwarfs. This case study illustrates that deep galaxy redshift surveys are needed to gain insight into the diverse environments that host dense and potentially star-forming gas.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-10-22T18:00:03.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "cosmic ultraviolet baryon survey",
      "early-type galaxy",
      "bearing dla",
      "deep galaxy redshift surveys",
      "line-of-sight velocity offset dv"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 19,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}