{
  "id": "2006.08400",
  "version": "v1",
  "published": "2020-06-15T13:44:45.000Z",
  "updated": "2020-06-15T13:44:45.000Z",
  "title": "Cold Molecular Gas and Free-Free Emission from Hot, Dust-Obscured Galaxies at $z$~3",
  "authors": [
    "J. I. Penney",
    "A. W. Blain",
    "R. J. Assef",
    "T. Diaz-Santos",
    "J. J. González-López",
    "C. -W. Tsai",
    "M. Aravena",
    "P. R. M. Eisenhardt",
    "S. F. Jones",
    "H. D. Jun",
    "M. Kim",
    "D. Stern",
    "J. Wu"
  ],
  "comment": "15 pages, 12 figures, accepted for publication in MNRAS",
  "doi": "10.1093/mnras/staa1582",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We report on observations of redshifted CO(1-0) line emission and observed-frame $\\rm\\sim$ 30GHz radio continuum emission from five ultra-luminous, mid-IR selected hot, Dust-Obscured Galaxies (Hot DOGs) at $z\\rm\\gtrsim$ 3 using the Karl G. Jansky Very Large Array. We detect CO(1-0) line emission in all five Hot DOGs, with one of them at high signal to noise. We analyse FIR-radio spectral energy distributions, including dust, free-free and synchrotron emission for the galaxies. We find that most of the 115 GHz rest-frame continuum is mostly due to synchrotron or free-free emission, with only a potentially small contribution from thermal emission. We see a deficit in the rest-frame 115 GHz continuum emission compared to dusty star-forming galaxies (DSFGs) and sub-millimetre galaxies (SMGs) at high redshift, suggesting that Hot DOGs do not have similar cold gas reserves compared with star-forming galaxies. One target, W2305-0039, is detected in the FIRST 1.4 GHz survey, and is likely to possess compact radio jets. We compare to the FIR-radio correlation, and find that at least half of the Hot DOGs in our sample are radio-quiet with respect to normal galaxies. These findings suggest that Hot DOGs have comparably less cold molecular gas than star-forming galaxies at lower, $z\\rm\\sim$ 2 redshifts, and are dominated by powerful, yet radio-quiet AGN.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-06-15T13:44:45.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "cold molecular gas",
      "free-free emission",
      "hot dogs",
      "dust-obscured galaxies",
      "star-forming galaxies"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 15,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}