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Einstein Observatory SSS and MPC observations of the complex X-ray spectra of Seyfert galaxiesThe X-ray spectra of 25 Seyfert galaxies measured with the Solid State Spectrometer on the Einstein Observatory have been investigated. 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. It is found that the best-fit single-power-law indices generally agree with those previously reported, but that soft excesses of some form are inferred for about 48 percent 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.
Document ID
19920030035
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Turner, T. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Weaver, K. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mushotzky, R. F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Holt, S. S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Madejski, G. M.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
November 1, 1991
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 381
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
92A12659
Distribution Limits
Public
Copyright
Other

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