Statistical analysis of the radio properties of a large sample of 374 optically selected quasars

Abstract

Using a large, unbiased sample of 374 optically selected QSOs, of which 54 are radio detected, the authors have computed for different redshift ranges the probability distribution function ψ(R) of R defined as the ratio of monochromatic luminosities at 15 GHz and 2500 Å in the QSO's rest frame. A significant variation of ψ(R) with redshift is noticed.