Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...266...65w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 266, no. 1, p. 65-71.
Astronomy and Astrophysics
Astronomy
8
Active Galactic Nuclei, Seyfert Galaxies, Ultraviolet Emission, X Ray Sources, Astronomical Spectroscopy, Energy Bands, Exosat Satellite, Spaceborne Astronomy
Scientific paper
We analyze the behavior of X-ray spectral variations in Seyfert 1 type active galactic nuclei observed many times in the 2-10 keV energy band. The selected sources are compatible with a separation into two groups distinguished by different kinds of X-ray variability and by different ratios of ultraviolet to X-ray fluxes. In the first group of objects the X-ray spectral variations are related to the ratio of the medium X-ray flux to the ultraviolet or soft X-ray flux while in the second group the spectra steepen when the sources brighten. The two different kinds of X-ray variability are related to the strength of the blue bump and may be linked to the relative importance of different cooling processes in the X-ray sources of these objects.
Courvoisier Thierry J. -L.
Walter Robert
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