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ROSAT All Sky Survey AGN Spectra: Constraints on accretion disks

Published online by Cambridge University Press:  19 July 2016

P. Friedrich ,
T. Dörrer ,
H. Brunner  and
R. Staubert
P. Friedrich
Affiliation:
Astronomy Institute, University of Tübingen, Germany
T. Dörrer
Affiliation:
Astronomy Institute, University of Tübingen, Germany
H. Brunner
Affiliation:
Astronomy Institute, University of Tübingen, Germany
R. Staubert
Affiliation:
Astronomy Institute, University of Tübingen, Germany

Abstract

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We found that ROSAT spectra of a sample of 89 AGN are generally steeper than 0.7. The excess above a hard X-ray power law spectrum in this energy range which has been found already with Einstein and EXOSAT for some AGN is now seen very clearly in most sources. Our α-disk models (Dörrer et al., 1992 and references therein) which include Comptonization and relativistic corrections are in agreement with the measured soft excesses when the (ṀEdd., α) parameter space is restricted to α > 0.4 and ṀEdd. ε [0.4, 0.8] (ṀEdd.: Eddington accretion rate).

Type
Poster Contributions: X-Rays and Higher Energies
Information
Symposium - International Astronomical Union , Volume 159: Multi-Wavelength Continuum Emission of AGN , 1994 , pp. 374
Copyright
Copyright © Kluwer 1994 

References

Dörrer, T., Friedrich, P., Brunner, H., Staubert, R., Pussel, V., Riffert, H., Ruder, H.: 1992, X-ray emission from active galactic nuclei and the cosmic X-ray background , eds. Brinkmann, and Trümper, , MPE report 235, 130 Google Scholar