{
  "id": "1803.01839",
  "version": "v1",
  "published": "2018-03-05T18:59:21.000Z",
  "updated": "2018-03-05T18:59:21.000Z",
  "title": "Detection of [O III] at z~3: A Galaxy above the Main Sequence, Rapidly Assembling its Stellar Mass",
  "authors": [
    "Amit Vishwas",
    "Carl Ferkinhoff",
    "Thomas Nikola",
    "Stephen C. Parshley",
    "Justin P. Schoenwald",
    "Gordon J. Stacey",
    "Sarah J. U. Higdon",
    "James L. Higdon",
    "Axel Weiß",
    "Rolf Güsten",
    "Karl M. Menten"
  ],
  "comment": "11 pages, 3 figures, accepted for publication in The Astrophysical Journal",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We detect bright emission in the far infrared fine structure [O III] 88$\\mu$m line from a strong lensing candidate galaxy, H-ATLAS J113526.3-014605, hereafter G12v2.43, at z=3.127, using the $\\rm 2^{nd}$ generation Redshift (z) and Early Universe Spectrometer (ZEUS-2) at the Atacama Pathfinder Experiment Telescope (APEX). This is only the fifth detection of this far-IR line from a sub-millimeter galaxy at the epoch of galaxy assembly. The observed [O III] luminosity of $7.1\\times10^{9}\\,\\rm(\\frac{10}{\\mu})\\,\\rm{L_{\\odot}}\\,$ likely arises from HII regions around massive stars, and the amount of Lyman continuum photons required to support the ionization indicate the presence of $(1.2-5.2)\\times10^{6}\\,\\rm(\\frac{10}{\\mu})$ equivalent O5.5 or higher stars; where $\\mu$ would be the lensing magnification factor. The observed line luminosity also requires a minimum mass of $\\sim 2\\times 10^{8}\\,\\rm(\\frac{10}{\\mu})\\,\\rm{M_{\\odot}}\\,$ in ionized gas, that is $0.33\\%$ of the estimated total molecular gas mass of $6\\times10^{10}\\,\\rm(\\frac{10}{\\mu})\\,\\rm{M_{\\odot}}\\,$. We compile multi-band photometry tracing rest-frame UV to millimeter continuum emission to further constrain the properties of this dusty high redshift star-forming galaxy. Via SED modeling we find G12v2.43 is forming stars at a rate of 916 $\\rm(\\frac{10}{\\mu})\\,\\rm{M_{\\odot}}\\,\\rm{yr^{-1}}$ and already has a stellar mass of $8\\times 10^{10}\\,\\rm(\\frac{10}{\\mu})\\,\\rm{M_{\\odot}}\\,$. We also constrain the age of the current starburst to be $\\leqslant$ 5 million years, making G12v2.43 a gas rich galaxy lying above the star-forming main sequence at z$\\sim$3, undergoing a growth spurt and, could be on the main sequence within the derived gas depletion timescale of $\\sim$66 million years.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-03-05T18:59:21.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "main sequence",
      "stellar mass",
      "total molecular gas mass",
      "high redshift star-forming galaxy",
      "rapidly assembling"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}