{
  "id": "astro-ph/9711009",
  "version": "v1",
  "published": "1997-11-03T15:20:28.000Z",
  "updated": "1997-11-03T15:20:28.000Z",
  "title": "The UV spectrum of the narrow-line Seyfert 1 galaxy, REJ1034+396",
  "authors": [
    "E. M. Puchnarewicz",
    "K. O. Mason",
    "A. Siemiginowska"
  ],
  "comment": "5 pages, 2 figures. Accepted for publication in Monthly Notices of the Royal Astronomical Society. Also available from http://www.mssl.ucl.ac.uk/www_astro/preprints/preprints.html",
  "doi": "10.1046/j.1365-8711.1998.01286.x",
  "categories": [
    "astro-ph"
  ],
  "abstract": "We present UV spectroscopy of RE1034+396, taken with the Faint Object Spectrograph on the Hubble Space Telescope. With a spectral resolution of ~1-2A FWHM and a typical S/N of ~15 per diode, this is one of the first detailed UV spectra of an object in the narrow-line Seyfert 1 (NLS1) class. The spectrum probes the physics and kinematics of the high-ionization and coronal line gas, and the strength and form of the big blue bump component in the UV. We detect many emission lines, including Lyman alpha, CIV1549, HeII1640, CIII]1909 and MgII2798. We also identify a feature at 2647A (in the rest-frame) with highly-ionized iron [FeXI]2649; a line of the same species ([FeXI]7892) has also been seen in the optical spectrum. The velocity widths of the UV lines are relatively narrow (FWHM<2000 km/s) and similar to those of the optical lines, which suggests that all line emission in REJ1034+396, ie. including that of high- and low-ionization species and the forbidden lines, may be dominated by an intermediate-velocity (FWHM~1000 km/s), intermediate-density (log Ne~7.5 cm-3) region of gas. The slope of the UV continuum (alpha~0.9) is soft (ie. red) relative to quasars and the UV-to-soft X-ray flux ratio is unusually low implying that the big blue bump component is very weak in the UV. The present epoch UV to soft X-ray continuum is consistent with earlier data, demonstrating that this extreme big blue bump component is also very stable, unlike many other NLS1s which show extreme patterns of variability.",
  "revisions": [
    {
      "version": "v1",
      "updated": "1997-11-03T15:20:28.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "narrow-line seyfert",
      "uv spectrum",
      "extreme big blue bump component",
      "uv-to-soft x-ray flux ratio",
      "coronal line gas"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 462525
    }
  }
}