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Date and Time of the Query: 2019-08-23 T19:53:33 PDT
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For refcode 2000ApJ...533..821R:
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Copyright by American Astronomical Society. Reproduced by permission
2000ApJ...533..821R On the Inability of Comptonization to Produce the Broad X-Ray Iron Lines Observed in Seyfert Nuclei Christopher S. Reynolds and Jorn Wilms Received 1999 November 29; accepted 1999 December 3 ABSTRACT It has recently been suggested that Compton downscattering may give rise to the broad iron lines seen in the X-ray spectra of Seyfert 1 galaxies. This challenges the standard model, in which these lines originate from the innermost regions of the black hole accretion disk with Doppler shifts and gravitational redshifts giving rise to the broadened line profile. Here we apply observational constraints to the Compton downscattering model for MCG-6-30-15 and NGC 3516, the two best cases to date of Seyfert galaxies with relativistically broad lines. We show that the continuum source in MCG-6-30-15 required by the constrained model violates the blackbody limit. In the case of NGC 3516, only a very small region of parameter space is compatible with the constraints. Hence, we conclude that the Comptonization model is not a viable one for the broad line seen in these two objects. The accretion disk model remains the best interpretation of these data. Subject headings: galaxies: individual (MCG -6-30-15, NGC 3516)-galaxies: Seyfert-line: formation-X-rays: galaxies
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