Extra-Galactic Radio Source--I: The Interpretation of Radio Source-Counts

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Abstract
The dependence of radio source-counts on cosmological model and type of evolution is investigated. It is found to be unnecessary to assume any reduction in the number density of radio sources at earlier epochs. Luminosity evolution, rather than density evolution, and cosmological models with low density at the present epoch, are preferred: but the significant differences between cosmological models are reduced by the effect of electron scattering, and the uncertainty in the luminosity function. Density evolution is consistent with the data down to the 5C limit only if there is a luminosity-dependent truncation in the distribution of sources.

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