QSO optical counts and constraints on the X ray background

Details QSO optical counts and constraints on the X ray background QSO optical counts and constraints on the X ray background

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..909c&link_type=abstract

In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 2: AGN and the X Ray Background p 909-913 (SEE N90-258

Astronomy and Astrophysics

Astronomy

1

Astronomical Models, Background Radiation, Light (Visible Radiation), Quasars, X Ray Astronomy, Red Shift, Stellar Luminosity, Stellar Spectra, X Ray Sources, X Ray Spectra

Scientific paper

The optical and the X-ray properties of optically selected quasars are used to predict the soft X-ray source counts in the Einstein Imaging Proportional Counter (IPC) band. The optical quasar counts and the published alpha0x relations do not reproduce the observed X-ray source counts. The predicted counts exceed the observations by factors of five to fifty. These excesses arise from the low luminosity, low redshift active galactic nuclei, redshift range characterizing the optical sample. It is concluded that quasars cannot be major contributors to the soft X-ray background.

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