Quasar number counts and the X-ray background

Details Quasar number counts and the X-ray background Quasar number counts and the X-ray background

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....76l...1s&link_type=abstract

Astronomy and Astrophysics, vol. 76, no. 1, June 1979, p. L1, L2.

Astronomy and Astrophysics

Astronomy

38

Background Radiation, Cosmic X Rays, Quasars, Radiant Flux Density, X Ray Astronomy, Cosmology, Ultraviolet Radiation

Scientific paper

Data on the X-ray emission from quasars and on the X-ray background provide strong limitations on the number counts of quasars. In particular it is found that the log N-log S relation should level off significantly at B = 20 mag. Quasars probably account for more than half of the total X-ray background flux. These same data are incompatible with local theories of quasars.

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