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For refcode 1991ApJ...381...85T:
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1991ApJ...381...85T EINSTEIN OBSERVATORY 555 AND MPC OBSERVATIONS OF THE COMPLEX X-RAY SPECTRA OF SEYFERT GALAXIES T. J. TURNER, K. A. WEAVER, R. F. MUSHOTZKY, S. S. HOLT, AND G. M. MADEJSKI NASA/Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Code 666, Greenbelt, MD 20771 Received 1990 May 30; accepted 1991 May 13 ABSTRACT We have reinvestigated the X-ray spectra of 25 Seyfert galaxies measured with the Solid State Spectrometer on the Einstein Observatory. This new investigation utilizes simultaneous data from the Monitor Proportional Counter, and automatic correction for systematic effects in the Solid State Spectrometer which were previously handled subjectively. We find that the best-fit single-power-law indices generally agree with those previously reported, but that soft excesses of some form are inferred for ~48% of the sources. One possible explanation of the soft excess emission is a blend of soft X-ray lines, centered around 0.8 keV. The implications of these results for accretion disk models are discussed. Subject headings: galaxies: Seyfert - galaxies: X-rays - radiation mechanisms
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