Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...274..105w&link_type=abstract
Astronomy and Astrophysics, Vol. 274, NO. 1/JUL(I), P. 105, 1993
Astronomy and Astrophysics
Astrophysics
279
Scientific paper
The soft X-ray (0.1 - 2.4 keV) emission of 58 Seyfert type active galactic nuclei have been studied using the spectra obtained during the ROSAT all sky survey. These spectra are well represented by power law models with photon indices ranging between 1.6 and 3.4. The spectra usually do not show intrinsic absorption. A notable exception is Mrk 766 which is probably absorbed by molecular clouds located in the inner part of the Narrow Line Region. A soft X-ray excess above the extrapolation of the hard X-ray spectrum is detected in 90% of the sources. These soft X-ray excesses are well correlated to the strength of the "big blue bump" observed with IUE except for those sources which are highly absorbed in the ultraviolet. The strength of the ultraviolet to soft X-ray bump varies by a factor of hundred from object to object and it is not correlated either to the luminosity or to the radio-loudness. The data are consistent with the assumption that the ultraviolet to soft X-ray bump is similarly shaped in all Seyfert 1 galaxies of our sample. Neither thin nor thick accretion disk models can reproduce the available observations in a natural way.
Fink Henner
Walter Robert
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