{
  "id": "1803.08048",
  "version": "v2",
  "published": "2018-03-21T18:00:01.000Z",
  "updated": "2018-05-21T13:07:43.000Z",
  "title": "Hidden in plain sight: a massive, dusty starburst in a galaxy protocluster at z=5.7 in the COSMOS field",
  "authors": [
    "Riccardo Pavesi",
    "Dominik A. Riechers",
    "Chelsea E. Sharon",
    "Vernesa Smolcic",
    "Andreas L. Faisst",
    "Eva Schinnerer",
    "Christopher L. Carilli",
    "Peter L. Capak",
    "Nick Scoville",
    "Gordon J. Stacey"
  ],
  "comment": "16 pages, 9 figures, 4 tables, to appear in ApJ (accepted May 19, 2018)",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "We report the serendipitous discovery of a dusty, starbursting galaxy at z=5.667 (called CRLE hereafter), in close physical association to the \"normal\" Main Sequence galaxy HZ10 at z=5.654. CRLE was identified by detection of [CII], [NII] and CO(2-1) line emission, making it the highest redshift, most luminous starburst in the COSMOS field. This massive, dusty galaxy appears to be forming stars at a rate of at least 1500$\\,M_\\odot$ yr$^{-1}$ in a compact region only ~3 kpc in diameter. The dynamical and dust emission properties of CRLE suggest an ongoing merger driving the starburst, in a potentially intermediate stage relative to other known dusty galaxies at the same epoch. The ratio of [CII] to [NII] may suggest that an important contribution to the [CII] emission comes from a diffuse ionized gas component, which could be more extended than the dense, starbursting gas. CRLE appears to be located in a significant galaxy overdensity at the same redshift, potentially associated with a large scale cosmic structure recently identified in a Lyman Alpha Emitter survey. This overdensity suggests that CRLE and HZ10 reside in a protocluster environment, offering the tantalizing opportunity to study the effect of a massive starburst on protocluster star formation. Our findings support the interpretation that a significant fraction of the earliest galaxy formation may occur from the inside-out, within the central regions of the most massive halos, while rapidly evolving into the massive galaxy clusters observed in the local Universe.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2018-05-21T13:07:43.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "cosmos field",
      "galaxy protocluster",
      "dusty starburst",
      "plain sight",
      "main sequence galaxy hz10"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}