Masnou, J.Wilkes, BelindaElvis, MartinMcDowell, JonathanArnaud, K.2018-01-231991Masnou, J.L., B.J. Wilkes, M. Elvis, J.C. McDowell, and K.A. Arnaud. 1992. "The soft X-ray excess in Einstein quasar spectra." Astronomy and Astrophysics 253, no. 1 (January 1992): 35-48.0004-6361http://nrs.harvard.edu/urn-3:HUL.InstRepos:34718438An 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.en-USquasarsx-raysspectroscopyJournal Article2017-02-0819922018-01-23