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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