Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...454..660t&link_type=abstract
Astrophysical Journal v.454, p.660
Astronomy and Astrophysics
Astronomy
5
Accretion, Accretion Disks, Galaxies: Nuclei, Galaxies: Seyfert, Radiation Mechanisms: Nonthermal
Scientific paper
Multiwavelength accretion disk modeling is carried out on a sample of five Seyfert I galaxies possessing strong optical-ultraviolet soft X-ray emission components. It is found that while bare accretion disk models cannot account for the soft X-ray emission observed in these objects, the addition of a hot, Comptonizing component enables the soft X-ray emission to be accounted for within the black hole plus accretion disk paradigm. It is further found that the postulated nonthermal power-law component does not extend into the X-ray region, nor does it pass through the Comptonizing corona, placing limitations on any proposed physical explanation for this component. These results represent important steps toward understanding the underlying physics of the central regions of active galaxies.
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