The variation of radio luminosity with epoch and its effect on the angular diameter-redshift relation

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Luminosity, Radiant Flux Density, Radio Galaxies, Red Shift, Correlation, Cosmology

Scientific paper

For several values of the density parameter, correlations between radio luminosity at 178 MHz and redshift are derived in the case of the 166 3CR flux density-limited sample, where high redshift sources tend to be more powerful than those with lower redshifts. A strong correlation exists between luminosity and redshift which cannot be solely due to a selection effect. Attention is given to the consequences of this luminosity variation with epoch for the angular diameter-redshift relationship. It is found that for the density parameter values considered, linear size evolution of a particular form is needed to explain the observed Euclidean behavior.

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