Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...381...85t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 381, Nov. 1, 1991, p. 85-100.
Astronomy and Astrophysics
Astronomy
105
Galactic Radiation, Heao, Seyfert Galaxies, X Ray Spectra, Proportional Counters, Spaceborne Astronomy, Spectrometers
Scientific paper
The 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.
Holt Stephen S.
Madejski Greg M.
Mushotzky Richard F.
Turner Tracey Jane
Weaver Kimberley A.
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