{
  "id": "2010.14433",
  "version": "v1",
  "published": "2020-10-27T16:49:37.000Z",
  "updated": "2020-10-27T16:49:37.000Z",
  "title": "A Closer Look at Two of the Most Luminous Quasars in the Universe",
  "authors": [
    "Jan-Torge Schindler",
    "Xiaohui Fan",
    "Mladen Novak",
    "Bram Venemans",
    "Fabian Walter",
    "Feige Wang",
    "Jinyi Yang",
    "Minghao Yue",
    "Eduardo Banados",
    "Yun-Hsin Huang"
  ],
  "comment": "Accepted for publication in the Astrophysical Journal (ApJ)",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "Ultra-luminous quasars ($M_{1450} \\leq -29$) provide us with a rare view into the nature of the most massive and most rapidly accreting supermassive black holes (SMBHs). Following the discovery of two of these extreme sources, J0341${+}$1720 ($M_{1450}=-29.56$, $z=3.71$) and J2125${-}$1719 ($M_{1450}=-29.39$, $z=3.90$), in the Extremely Luminous Quasar Survey (ELQS) and its extension to the Pan-STARRS\\,1 footprint (PS-ELQS), we herein present an analysis of their rest-frame UV to optical spectroscopy. Both quasars harbor very massive SMBHs with $M_{\\rm{BH}}=6.73_{-0.83}^{+0.75}\\times10^{9}\\,M_{\\odot}$ and $M_{\\rm{BH}}=5.45_{-0.55}^{+0.60}\\times10^{9}\\,M_{\\odot}$, respectively, showing evidence of accretion above the Eddington limit ($L_{\\rm{bol}}/L_{\\rm{Edd}}=2.74_{-0.27}^{+0.39}$ and $L_{\\rm{bol}}/L_{\\rm{Edd}}=3.01_{-0.30}^{+0.34}$). NOEMA 3 millimeter observations of J0341${+}$1720 reveal a highly star-forming ($\\rm{SFR}\\approx1500\\,M_{\\odot}\\,\\rm{yr}^{-1}$), ultra-luminous infrared galaxy ($L_{\\rm{TIR}}\\approx1.0\\times10^{13}\\,L_{\\odot}$) host, which, based on an estimate of its dynamical mass, is only ${\\sim}30$ times more massive than the SMBH it harbors at its center. As examples of luminous super-Eddington accretion, these two quasars provide support for theories, which explain the existence of billion solar mass SMBHs ${\\sim}700$ million years after the Big Bang by moderate super-Eddington growth from standard SMBH seeds.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-10-27T16:49:37.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "luminous quasar",
      "closer look",
      "accreting supermassive black holes",
      "billion solar mass smbhs",
      "moderate super-eddington growth"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}