{
  "id": "astro-ph/9805154",
  "version": "v1",
  "published": "1998-05-12T17:05:09.000Z",
  "updated": "1998-05-12T17:05:09.000Z",
  "title": "X-ray and soft gamma-ray spectra of Broad-Line Radio Galaxies",
  "authors": [
    "Przemyslaw R. Wozniak",
    "Andrzej A. Zdziarski",
    "David Smith",
    "Greg M. Madejski",
    "W. Neil Johnson"
  ],
  "comment": "20 pages, 13 figures, to appear in MNRAS",
  "doi": "10.1046/j.1365-8711.1998.01831.x",
  "categories": [
    "astro-ph"
  ],
  "abstract": "We study X-ray and soft gamma-ray spectral properties of BLRGs using data from Ginga, ASCA, OSSE and EXOSAT. The X-ray spectra are well fitted by an intrinsic power-law continuum with an energy index of alpha ~ 0.7, moderately absorbed by a cold medium. In addition, the Ginga spectra show Fe K-alpha lines with an average equivalent width of ~ 100 eV, and, in some cases, Compton reflection humps. However, the latter components are significantly weaker than both those seen in radio-quiet Seyferts and those expected if the Fe K-alpha lines were due to reflection. Some ASCA and EXOSAT spectra show soft X-ray excesses below ~ 3 keV. When that component is taken into account, the Fe K-alpha lines in the ASCA data become unresolved with equivalent widths < 200 eV. Multiple observations of 3C 390.3 and 3C 382 show the Fe K-alpha line approximately constant in flux but accompanied by strong continuum variations. This indicates the bulk of the line is formed by matter at a distance much larger than an accretion-disk scale, consistent with the ASCA line width measurements. The column density of the matter required to account for the observed line fluxes is N_H > 10^23 cm^-2. Such a medium is in the line-of-sight in 3C 445 but it has to be out of it in other objects, in which the observed N_H are substantially lower. Thus, a cold medium with that N_H and covering a large solid angle is out of the line-of-sight in most objects. The spectra of BLRGs break and become softer above ~ 100 keV, as shown by a simultaneous ASCA/OSSE observation of 3C 120 and by the OSSE spectra being on average much softer than the X-ray spectra. Finally, we find the X-ray and gamma-ray spectral properties of Cen A intrinsically very similar to BLRGs studied here.",
  "revisions": [
    {
      "version": "v1",
      "updated": "1998-05-12T17:05:09.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "broad-line radio galaxies",
      "fe k-alpha lines",
      "x-ray spectra",
      "cold medium",
      "equivalent width"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 20,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 470487
    }
  }
}