{
  "id": "2202.07666",
  "version": "v1",
  "published": "2022-02-15T19:00:01.000Z",
  "updated": "2022-02-15T19:00:01.000Z",
  "title": "The ALMA REBELS Survey. Epoch of Reionization giants: properties of dusty galaxies at $z \\approx 7$",
  "authors": [
    "A. Ferrara",
    "L. Sommovigo",
    "P. Dayal",
    "A. Pallottini",
    "R. J. Bouwens",
    "V. Gonzalez",
    "H. Inami",
    "R. Smit",
    "R. A. A. Bowler",
    "R. Endsley",
    "P. Oesch",
    "S. Schouws",
    "D. Stark",
    "M. Stefanon",
    "M. Aravena",
    "E. da Cunha",
    "I. De Looze",
    "Y. Fudamoto",
    "L. Graziani",
    "J. Hodge",
    "D. Riechers",
    "R. Schneider",
    "H. S. B. Algera",
    "L. Barrufet",
    "A. P. S. Hygate",
    "I. Labbe",
    "C. Li",
    "T. Nanayakkara",
    "M. Topping",
    "P. van der Werf"
  ],
  "comment": "22 pages, 7 figures, accepted by MNRAS. Comments welcome",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "We analyse FIR dust continuum measurements for 14 galaxies ($z\\approx 7$) in the ALMA REBELS LP to derive their physical properties. Our model uses three input data: (a) the UV spectral slope, $\\beta$, (b) the observed UV continuum flux at $1500$A, $F_{\\rm UV}$, (c) the observed continuum flux at $\\approx 158\\mu$m, $F_{158}$, and considers Milky Way (MW) and SMC extinction curves, along with different dust geometries. We find that REBELS galaxies have (28-90.5)% of their star formation obscured; the total (UV+IR) star formation rates are in the range $31.5 < {\\rm SFR}/ (M_\\odot {\\rm yr}^{-1}) < 129.5$. The sample-averaged dust mass and temperature are $(1.3\\pm 1.1)\\times 10^7 M_\\odot$ and $52 \\pm 11$ K, respectively. In some galaxies dust is abundant (REBELS-14, $M'_d \\approx 3.4 \\times 10^7 M_\\odot$), or hot (REBELS-18, $T'_d \\approx 67$ K). The dust distribution is compact ($<0.3$ kpc for 70% of the galaxies). The dust yield per supernova is $0.1 \\le y_d/M_\\odot \\le 3.3$, with 70% of the galaxies requiring $y_d < 0.25 M_\\odot$. Three galaxies (REBELS-12, 14, 39) require $y_d > 1 M_\\odot$. With the SFR predicted by the model and a MW extinction curve, REBELS galaxies detected in [CII] nicely follow the local $L_{\\rm CII}-$SFR relation, and are approximately located on the Kennicutt-Schmidt relation. The sample-averaged gas depletion time is of $0.11\\, y_P^{-2}$ Gyr, where $y_P$ is the ratio of the gas-to-stellar distribution radius. For some systems a solution simultaneously matching the observed ($\\beta, F_{\\rm UV}, F_{158}$) values cannot be found. This occurs when the index $I_m = (F_{158}/F_{\\rm UV})/(\\beta-\\beta_{\\rm int})$, where $\\beta_{\\rm int}$ is the intrinsic UV slope, exceeds $I_m^*\\approx 1120$ for a MW curve. For these objects we argue that the FIR and UV emitting regions are not co-spatial, questioning the use of the IRX-$\\beta$ relation.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-02-15T19:00:01.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "alma rebels survey",
      "reionization giants",
      "dusty galaxies",
      "analyse fir dust continuum measurements",
      "properties"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 22,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}