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We present and analyse plots of linear size–luminosity and linearsize–redshift data for a sample of compact steep-spectrum sources (CSSs)and use them to investigate the currently popular but controversialorientation-based unification hypothesis for high-luminosity radio sources.This is based on the assumption that CSSs belong to a separate class ofobject. Our results show that the observed distributions of linear size(D) as a function of redshift (z)and radio luminosity (P) are in accord with the unifiedscheme in which CSS radio galaxies and CSS quasars are expected to beindistinguishable in theirD−P/zcorrelations. This is particularly true when the two classes of object areproperly matched in redshift. In the unification paradigm, both radio galaxiesand quasars are expected to differ only in their orientation-dependentproperties; all other properties should appear similar.

Redshift and Luminosity Dependence of Linear Sizes of Compact Steep Spectrum Sources and the Quasar/Galaxy Unification Scheme