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The soft X-ray excess in Einstein quasar spectraAn SNR-limited subsample of 14 quasars from the Wilkes and Elvis (1987) sample is presently investigated for low-energy excess above a high-energy power law in the X-ray spectra obtained by the Einstein Imaging Proportional Counter. A significant excess that is 1-6 times as strong as the high-energy component at 0.2 keV is noted in eight of the 14 objects. In the case of 3C273, multiple observations show the excess to be variable.
Document ID
19920040184
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Masnou, J. L. (Paris Observatoire, Meudon, France)
Wilkes, B. J. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Elvis, M. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Mcdowell, J. C. (NASA Marshall Space Flight Center Huntsville, AL; Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, United States)
Arnaud, K. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Publication Information
Publication: Astronomy and Astrophysics
Volume: 253
Issue: 1 Ja
ISSN: 0004-6361
Subject Category
Astrophysics
Accession Number
92A22808
Funding Number(s)
CONTRACT_GRANT: NAS8-30751
Distribution Limits
Public
Copyright
Other

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