{
  "id": "1504.00058",
  "version": "v1",
  "published": "2015-03-31T22:48:38.000Z",
  "updated": "2015-03-31T22:48:38.000Z",
  "title": "Rest-frame Optical Spectra and Black Hole Masses of 3<z<6 Quasars",
  "authors": [
    "Hyunsung David Jun",
    "Myungshin Im",
    "Hyung Mok Lee",
    "Youichi Ohyama",
    "Jong-Hak Woo",
    "Xiaohui Fan",
    "Tomotsugu Goto",
    "Dohyeong Kim",
    "Ji Hoon Kim",
    "Minjin Kim",
    "Myung Gyoon Lee",
    "Takao Nakagawa",
    "Chris Pearson",
    "Stephen Serjeant"
  ],
  "comment": "25 pages, accepted to ApJ",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "We present the rest-frame optical spectral properties of 155 luminous quasars at 3.3<z<6.4 taken with the AKARI space telescope, including the first detection of H$\\alpha$ emission line as far out as z~6. We extend the scaling relation between the rest-frame optical continuum and line luminosity of active galactic nuclei (AGNs) to the high luminosity, high redshift regime that has rarely been probed before. Remarkably, we find that a single log-linear relation can be applied to the 5100${\\rm \\AA}$ and H$\\alpha$ AGN luminosities over a wide range of luminosity (10$^{42}$<$L_{5100}$<10$^{47}$ergs/s) or redshift (0<z<6), suggesting that the physical mechanism governing this relation is unchanged from z=0 to 6, over five decades in luminosity. Similar scaling relations are found between the optical and the UV continuum luminosities or line widths. Applying the scaling relations to the H$\\beta$ black hole mass ($M_{\\rm BH}$) estimator of local AGNs, we derive the $M_{\\rm BH}$ estimators based on H$\\alpha$, MgII, and CIV lines, finding that the UV-line based masses are overall consistent with the Balmer-line based, but with a large intrinsic scatter of 0.40dex for the CIV estimates. Our 43 $M_{\\rm BH}$ estimates from H$\\alpha$ confirm the existence of BHs as massive as ~10$^{10}M_{\\odot}$ out to z~5, and provide a secure footing for previous MgII-line based studies that a rapid $M_{\\rm BH}$ growth has occurred in the early universe.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-03-31T22:48:38.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "black hole mass",
      "luminosity",
      "scaling relation",
      "rest-frame optical spectral properties",
      "akari space telescope"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/806/1/109"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 25,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1357395
    }
  }
}