Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...233...40w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 233, no. 1, July 1990, p. 40-52. Research supported by SNSF.
Astronomy and Astrophysics
Astrophysics
26
Compton Effect, Galactic Radiation, Galactic Structure, Ultraviolet Spectra, X Ray Spectra, Emission Spectra, Exosat Satellite, Iue, Seyfert Galaxies, X Ray Spectroscopy
Scientific paper
Ultraviolet, soft and hard X-ray observations of NGC 5548 performed by IUE and Exosat give us a clear picture for the geometry of the emitting source. This picture is provided by the correlations observed between the large variations of the ultraviolet continuum, of the soft and hard X-ray fluxes, of the hard X-ray power law index, and of the equivalent width of the 6.5 keV Iron line. The modifications of the power law index and of the X-ray fluxes show that the hard X-ray photons are emitted by optically thin thermal comptonization of soft X-ray photons. The distance between the hard X-ray emitting cloud and the accretion disk enlarges with increasing central activity. The whole set of X-ray long-term variations and probably a part of the broad emission line variations are related to this distance.
Courvoisier Thierry J. -L.
Walter Robert
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