The interpretation of optical counts of quasars

Details The interpretation of optical counts of quasars The interpretation of optical counts of quasars

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.195..497c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 195, May 1981, p. 497-504.

Astronomy and Astrophysics

Astronomy

23

Astronomical Spectroscopy, Emission Spectra, Quasars, Astronomical Models, Evolution (Development), Luminosity, Red Shift

Scientific paper

Calculations of the number of quasars as a function of limiting B magnitude for different assumptions about the evolution of the quasar population are presented. The effect of emission lines is taken into account by using an average quasar spectrum. The available observations are discussed and compared with the models. A good fit to the observations is obtained with an exponential luminosity evolution, at a rate very similar to that needed to explain the low-frequency radio source-counts. Pure density-evolution models, of the forms usually assumed, give a poor fit to the observations, but a mixed evolution, of both density and luminosity, is acceptable.

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