{
  "id": "astro-ph/0601464",
  "version": "v1",
  "published": "2006-01-19T23:14:39.000Z",
  "updated": "2006-01-19T23:14:39.000Z",
  "title": "The puzzle of the soft X-ray excess in AGN: absorption or reflection?",
  "authors": [
    "L. Chevallier",
    "S. Collin",
    "A. -M. Dumont",
    "B. Czerny",
    "M. Mouchet",
    "A. C. Goncalves",
    "R. W. Goosmann"
  ],
  "comment": "4 pages, 3 figures, abstracts SF2A-2005, published by EDP-Sciences Conference Series",
  "journal": "SF2A-2005: Semaine de l'Astrophysique Francaise, meeting held in Strasbourg, France, June 27 - July 1, 2005, Edited by F. Casoli, T. Contini, J.M. Hameury and L. Pagani. Published by EdP-Sciences, Conference Series, 2005, p. 519",
  "categories": [
    "astro-ph"
  ],
  "abstract": "The 2-10 keV continuum of AGN is generally well represented by a single power law. However, at smaller energies the continuum displays an excess with respect to the extrapolation of this power law, called the ''soft X-ray excess''. Until now this soft X-ray excess was attributed, either to reflection of the hard X-ray source by the accretion disk, or to the presence of an additional comptonizing medium, giving a steep spectrum. An alternative solution proposed by Gierlinski and Done (2004) is that a single power law well represents both the soft and the hard X-ray emission and the impression of the soft X-ray excess is due to absorption of a primary power law by a relativistic wind. We examine the advantages and drawbacks of reflection versus absorption models, and we conclude that the observed spectra can be well modeled, either by absorption (for a strong excess), or by reflection (for a weak excess). However the physical conditions required by the absorption models do not seem very realistic: we would prefer an ''hybrid model''.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2006-01-19T23:14:39.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "soft x-ray excess",
      "reflection",
      "single power law",
      "absorption models",
      "hard x-ray source"
    ],
    "tags": [
      "conference paper",
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 708945
    }
  }
}