{
  "id": "2002.04816",
  "version": "v1",
  "published": "2020-02-12T06:21:11.000Z",
  "updated": "2020-02-12T06:21:11.000Z",
  "title": "ALMA Imaging of the CO(7-6) Line Emission in the Submillimeter Galaxy LESS 073 at redshift 4.755$^\\star$",
  "authors": [
    "Yinghe Zhao",
    "Nanyao Lu",
    "Tanio Díaz-Santos",
    "Yu Gao",
    "C. Kevin Xu",
    "Vassilis Charmandaris",
    "Hanae Inami",
    "Dimitra Rigopoulou",
    "David B. Sanders",
    "Jiasheng Huang",
    "Zhong Wang"
  ],
  "comment": "8 pages, 6 figures, accepted for publication in ApJ",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "In this paper we present our imaging observations on the CO(7-6) line and its underlying continuum emission of the young submillimeter galaxy LESS 073 at redshift 4.755, using the Atacama Large Millimeter/submillimeter Array (ALMA). At the achieved resolution of $\\sim$$1^{\\prime\\prime}.2\\times0^{\\prime\\prime}.9$ ($8\\times6$~kpc$^2$), the CO(7-6) emission is largely unresolved (with a deconvolved size of $1^{\\prime\\prime}.1(\\pm0^{\\prime\\prime}.5) \\times 0^{\\prime\\prime}.9(\\pm0^{\\prime\\prime}.8)$), and the continuum emission is totally unresolved. The CO(7-6) line emission has an integrated flux of $0.86\\pm0.08$~Jy km/s, and a line width of $343\\pm40$ km/s. The continuum emission has a flux density of 0.51 mJy. By fitting the observed far-infrared (FIR) spectral energy distribution of LESS 073 with a single-temperature modified blackbody function, we obtained a dust temperature $T_{\\rm dust}=57.6\\pm3.5$ K, 60-to-100 $\\mu$m flux density ratio $f_{60}/f_{100}=0.86\\pm0.08$, and total infrared luminosity $L_{\\rm IR}=(5.8\\pm0.9) \\times 10^{12}~L_\\odot$. The SED-fit-based $f_{60}/f_{100}$ is consistent with those estimated from various line ratios as advocated by our earlier work, indicating that those proposed line-ratio-based method can be used to practically derive $f_{60}/f_{100}$ for high-$z$ sources. The total molecular gas mass of LESS 073 is $(3.3\\pm1.7) \\times10^{10}~M_\\odot$, and the inferred gas depletion time is about 43 Myr.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-02-12T06:21:11.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "line emission",
      "alma imaging",
      "atacama large millimeter/submillimeter array",
      "inferred gas depletion time",
      "young submillimeter galaxy"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}