{
  "id": "1109.3330",
  "version": "v1",
  "published": "2011-09-15T12:09:04.000Z",
  "updated": "2011-09-15T12:09:04.000Z",
  "title": "Accretion Onto the Supermassive Black Hole in the High-redshift Radio-loud AGN 0957+561",
  "authors": [
    "Rodrigo Gil-Merino",
    "Luis J. Goicoechea",
    "Vyacheslav N. Shalyapin",
    "Vittorio F. Braga"
  ],
  "comment": "21 pages, 7 text pages, 13 figures, 2 tables, accepted by The Astrophysical Journal",
  "categories": [
    "astro-ph.GA",
    "astro-ph.HE"
  ],
  "abstract": "We present the results of our X-ray, UV and optical monitoring campaign of the first gravitationally lensed AGN from late 2009 to mid 2010. The trailing (B) image of the AGN 0957+561 shows the intrinsic continuum variations that were predicted in advance based on observations of the leading (A) image in the gr optical bands. This multiwavelength variability of the B image allows us to carry out a reverberation mapping analysis in the radio-loud AGN 0957+561 at redshift z = 1.41. We find that the U-band and r-band light curves are highly correlated with the g-band record, leading and trailing it by 3 +/- 1 days (U band) and 4 +/- 1 days (r band). These 1-sigma measurements are consistent with a scenario in which flares originated in the immediate vicinity of the supermassive black hole are thermally reprocessed in a standard accretion disk at about 10-20 Schwarzschild radii from the central dark object. We also report that the light curve for the X-ray emission with power-law spectrum is delayed with respect to those in the Ugr bands by about 32 days. Hence, the central driving source can not be a standard corona emitting the observed power-law X-rays. This result is also supported by X-ray reprocessing simulations and the absence of X-ray reflection features in the spectrum of 0957+561. We plausibly interpret the lack of reflection and the 32-day delay as evidence for a power-law X-ray source in the base of the jet at a typical height of about 200 Schwarzschild radii. A central EUV source would drive the variability of 0957+561.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-09-15T12:09:04.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "supermassive black hole",
      "high-redshift radio-loud agn",
      "schwarzschild radii",
      "power-law x-ray",
      "central dark object"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/744/1/47",
      "journal": "The Astrophysical Journal",
      "year": 2012,
      "month": "Jan",
      "volume": 744,
      "number": 1,
      "pages": 47
    },
    "note": {
      "typesetting": "TeX",
      "pages": 21,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 927582,
      "adsabs": "2012ApJ...744...47G"
    }
  }
}