Hostname: page-component-586b7cd67f-g8jcs Total loading time: 0 Render date: 2024-11-24T15:12:39.050Z Has data issue: false hasContentIssue false

ROSAT All Sky Survey AGN Spectra: Constraints on accretion disks

Published online by Cambridge University Press:  19 July 2016

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 (Edd. , α) parameter space is restricted to α > 0.4 and Edd. ε [0.4, 0.8] (Edd. : Eddington accretion rate).

Type
Poster Contributions: X-Rays and Higher Energies
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