{
  "id": "1802.07772",
  "version": "v1",
  "published": "2018-02-21T19:50:19.000Z",
  "updated": "2018-02-21T19:50:19.000Z",
  "title": "Dusty galaxies in the Epoch of Reionization: simulations",
  "authors": [
    "C. Behrens",
    "A. Pallottini",
    "A. Ferrara",
    "S. Gallerani",
    "L. Vallini"
  ],
  "comment": "15 pages, accepted for publication in MNRAS",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "The recent discovery of dusty galaxies well into the Epoch of Reionization (redshift $z>6$) poses challenging questions about the properties of the interstellar medium in these pristine systems. By combining state-of-the-art hydrodynamic and dust radiative transfer simulations, we address these questions focusing on the recently discovered dusty galaxy A2744_YD4 ($z=8.38$, Laporte et al. 2017}). We show that we can reproduce the observed spectral energy distribution (SED) only using different physical values with respect to the inferred ones by Laporte et al(2017), i.e. a star formation rate of $\\mathrm{SFR} = 78\\;\\rm M_\\odot \\rm yr^{-1}$, a factor $\\approx 4$ higher than deduced from simple Spectral Energy Distribution fitting. In this case we find: (a) dust attenuation (corresponding to $\\tau_V=1.4$) is consistent with a Milky Way extinction curve; (b) the dust-to-metal ratio is low, $f_\\mathrm{d} \\sim 0.08$, implying that early dust formation is rather inefficient; (c) the luminosity-weighted dust temperature is high, $T_d=91\\pm 23\\, \\rm K$, as a result of the intense ($\\approx 100\\times$ MW) interstellar radiation field; (d) due to the high $T_d$, the ALMA Band 7 detection can be explained by a limited dust mass, $M_d=1.6\\times 10^6 $M$_\\odot$. Finally, the high dust temperatures might solve the puzzling low infrared excess recently deduced for high-$z$ galaxies from the IRX-$\\beta$ relation.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-02-21T19:50:19.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "dusty galaxy",
      "spectral energy distribution fitting",
      "reionization",
      "simple spectral energy distribution",
      "milky way extinction curve"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 15,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}