{
  "id": "0801.3729",
  "version": "v1",
  "published": "2008-01-24T10:49:37.000Z",
  "updated": "2008-01-24T10:49:37.000Z",
  "title": "Optical monitoring of the z=4.40 quasar Q 2203+292",
  "authors": [
    "E. P. Ovcharov",
    "P. L. Nedialkov",
    "A. T. Valcheva",
    "V. D. Ivanov",
    "N. A. Tikhonov",
    "I. S. Stanev",
    "A. B. Kostov",
    "Ts. B. Georgiev"
  ],
  "comment": "9 pages, 8 figures, accepted for publication in MNRAS",
  "doi": "10.1111/j.1365-2966.2008.12990.x",
  "categories": [
    "astro-ph"
  ],
  "abstract": "We report Cousins R-band monitoring of the high-redshift (z=4.40) radio quiet quasar Q 2203+292 from May 1999 to October 2007. The quasar shows maximum peak-to-peak light curve amplitude of ~0.3 mag during the time of our monitoring, and ~0.9 mag when combined with older literature data. The rms of a fit to the light curve with a constant is 0.08 mag and 0.2 mag, respectively. The detected changes are at ~3-sigma level. The quasar was in a stable state during the recent years and it might have undergone a brightening event in the past. The structure function analysis concluded that the object shows variability properties similar to those of the lower redshift quasars. We set a lower limit to the Q 2203+292 broad line region mass of 0.3-0.4 M_odot. Narrow-band imaging search for redshifted Ly_alpha from other emission line objects at the same redshift shows no emission line objects in the quasar vicinity.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2008-01-24T10:49:37.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "emission line objects",
      "optical monitoring",
      "maximum peak-to-peak light curve amplitude",
      "broad line region mass",
      "structure function analysis"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "Wiley-Blackwell",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2008,
      "month": "May",
      "volume": 386,
      "number": 2,
      "pages": 819
    },
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 778060,
      "adsabs": "2008MNRAS.386..819O"
    }
  }
}