{
  "id": "astro-ph/9809308",
  "version": "v1",
  "published": "1998-09-24T14:28:33.000Z",
  "updated": "1998-09-24T14:28:33.000Z",
  "title": "Constraints on a soft X-ray excess in the quasar 3C 279",
  "authors": [
    "A. J. Lawson",
    "I. M. McHardy"
  ],
  "comment": "4 pages, 3 figures, accepted for publication in MNRAS. Style files needed: epsf, mn.sty and new_cite.sty (this last is included in submission)",
  "categories": [
    "astro-ph"
  ],
  "abstract": "We present the results of a three-week daily monitoring campaign on the quasar 3C 279 by the X-ray satellites RXTE and ROSAT. A cross correlation provides no evidence for any time lag between the very similar soft and hard X-ray light curves, and the source shows no significant spectral variability over the observing period. There is no evidence to support the presence of a soft excess, with a 99 per cent upper limit on any such component of 25 per cent of the total observed luminosity in the 0.1-2 keV band (< 3 x 10^38 W). This fraction (but not the luminosity) is significantly less than that of the soft excess observed in 3C 273.",
  "revisions": [
    {
      "version": "v1",
      "updated": "1998-09-24T14:28:33.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "soft x-ray excess",
      "quasar 3c",
      "constraints",
      "hard x-ray light curves",
      "soft excess"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1046/j.1365-8711.1998.01954.x"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 490356
    }
  }
}