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Published online by Cambridge University Press: 14 August 2015
The ultimate aim of statistical studies of redshift, magnitudes and flux densities of quasars is to derive the general luminosity function Φ(z, Fopt, Frad, α, …) which describes the space density as a function of redshift, intrinsic optical luminosity, intrinsic radio luminosity, spectral index, etc. We assume throughout that the emission-line redshifts z of quasars are cosmological. The function Φ contains information that will be pertinent for any theory of the formation and evolution of quasars.