{
  "id": "2109.10378",
  "version": "v1",
  "published": "2021-09-21T18:02:48.000Z",
  "updated": "2021-09-21T18:02:48.000Z",
  "title": "Normal, Dust-Obscured Galaxies in the Epoch of Reionization",
  "authors": [
    "Y. Fudamoto",
    "P. A. Oesch",
    "S. Schouws",
    "M. Stefanon",
    "R. Smit",
    "R. J. Bouwens",
    "R. A. A. Bowler",
    "R. Endsley",
    "V. Gonzalez",
    "H. Inami",
    "I. Labbe",
    "D. Stark",
    "M. Aravena",
    "L. Barrufet",
    "E. da Cunha",
    "P. Dayal",
    "A. Ferrara",
    "L. Graziani",
    "J. Hodge",
    "A. Hutter",
    "Y. Li",
    "I. De Looze",
    "T. Nanayakkara",
    "A. Pallottini",
    "D. Riechers",
    "R. Schneider",
    "G. Ucci",
    "P. van der Werf",
    "C. White"
  ],
  "comment": "16 pages, 7 figures, 4 tables, published in Nature",
  "doi": "10.1038/s41586-021-03846-z",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "Over the past decades, rest-frame ultraviolet (UV) observations have provided large samples of UV luminous galaxies at redshift (z) greater than 6, during the so-called epoch of reionization. While a few of these UV identified galaxies revealed significant dust reservoirs, very heavily dust-obscured sources at these early times have remained elusive. They are limited to a rare population of extreme starburst galaxies, and companions of rare quasars. These studies conclude that the contribution of dust-obscured galaxies to the cosmic star formation rate density at $z>6$ is sub-dominant. Recent ALMA and Spitzer observations have identified a more abundant, less extreme population of obscured galaxies at $z=3-6$. However, this population has not been confirmed in the reionization epoch so far. Here, we report the discovery of two dust-obscured star forming galaxies at $z=6.6813\\pm0.0005$ and $z=7.3521\\pm0.0005$. These objects are not detected in existing rest-frame UV data, and were only discovered through their far-infrared [CII] lines and dust continuum emission as companions to typical UV-luminous galaxies at the same redshift. The two galaxies exhibit lower infrared luminosities and star-formation rates than extreme starbursts, in line with typical star-forming galaxies at $z\\sim7$. This population of heavily dust-obscured galaxies appears to contribute 10-25 per cent to the $z>6$ cosmic star formation rate density.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-09-21T18:02:48.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "dust-obscured galaxies",
      "cosmic star formation rate density",
      "galaxies revealed significant dust",
      "revealed significant dust reservoirs",
      "identified galaxies revealed significant"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "Nature"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}