Abstract
We investigate the populations and evolution of normal and active galaxies by extending the recent infrared source count model of Rowan-Robinson into the radio. The far-infrared-radio correlation is used to extend the spectral energy distributions to the radio region, and it is assumed that there are two distinct populations of quasar: radio-loud and radio-quiet. It is found that the radio luminosity function and source count data are best fitted when the fraction of quasars that are radio-loud is allowed to increase with optical luminosity. The implications for this are discussed, as are the possible causes for the variation in radio-loud fraction.
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