The soft X-ray excess in Einstein quasar spectra

Details The soft X-ray excess in Einstein quasar spectra The soft X-ray excess in Einstein quasar spectra

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...253...35m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 253, no. 1, Jan. 1992, p. 35-48. Research supported by Ministere des Affaires

Astronomy and Astrophysics

Astronomy

51

Astronomical Spectroscopy, Quasars, Stellar Spectra, X Ray Astronomy, X Ray Spectroscopy, Proportional Counters, Spectrum Analysis, X Ray Spectra

Scientific paper

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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