Cosmological evolution of linear sizes of radio galaxies

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Abstract
The angular size–redshift relation is investigated for complete samples of radio galaxies of a constant radio luminosity by combining data on relatively nearby galaxies in strong and intermediate source surveys with distant galaxies in the recent Leiden–Berkeley deep radio and optical survey. The data are shown to provide strong evidence for linear-size evolution independent of any luminosity–size relationship. It also appears unlikely that the contribution of compact steep-spectrum sources at large redshifts can obviate the need for size evolution.

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