Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..915c&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 2: AGN and the X Ray Background p 915-919 (SEE N90-258
Astronomy and Astrophysics
Astronomy
2
Accretion Disks, Extreme Ultraviolet Radiation, Quasars, Seyfert Galaxies, Stellar Spectra, Astronomical Models, Background Radiation, Continuous Spectra, Light (Visible Radiation), Red Shift, Spectrum Analysis
Scientific paper
The recent discovery of the high redshift quasar HS1700+6416 and repeated observations of the Seyfert 1 galaxy Fairall 9 reveal a striking difference between their continuous spectral shape in the Extreme Ultraviolet (EUV). A geometrically thin alpha disk model cannot account for the energetic EUV continuum observed in HS1700+6416. The EUV spectral shape of F9 fits the predictions from the thin accretion disk model. These results suggest the existence of a difference between Seyfert 1 galaxies and quasars, the former having a cooler bump than the latter.
Clavel Jean
Reimers Dieter
Santos-Lleo Maria
Wamsteker Willelm
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