Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..525w&link_type=abstract
International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 525 - 526
Astronomy and Astrophysics
Astrophysics
Quasars: Uv Variations, Seyfert Galaxies: Uv Variations
Scientific paper
The ultraviolet spectral slope of individual Seyfert 1 galaxies and quasars, measured using IUE observations, varies considerably with time. Neither accretion disks nor optically thin emission models can explain these variations. The authors propose a method based on the variability properties of these objects to disentangle various components of constant spectral shape. This method is applied to 3C 273. A variable component and a stable component are thereby obtained. The spectral shape obtained for the variable component in 3C 273 is very well defined. It is not compatible with optically thin emission but marginally compatible with an accretion disk for very small viscosity parameter or external radius. The stable component can be reproduced by the sum of an infrared power-law, Fe II line blends and Balmer and Paschen continua.
Paltani Stephane
Walter Robert
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