NASA NTRS · 19920040184
The soft X-ray excess in Einstein quasar spectra
Abstract
An 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.
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Masnou, J. L., Wilkes, B. J., Elvis, M., Mcdowell, J. C., Arnaud, K. A.. 1992-01-01. The soft X-ray excess in Einstein quasar spectra. https://ntrs.nasa.gov/citations/19920040184
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