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In this Letter we present K-band data for a sample of gigahertz-peaked-spectrum (GPS) radio galaxies. We show that the dispersion of the K-band Hubble diagram is small and comparable to that of the R-band Hubble diagram for these sources. The r − K colours of GPS galaxies evolve with redshift in agreement with models for both passively evolving and non-evolving elliptical galaxies. This behaviour ...

Near-infrared imaging of gigahertz-peaked-spectrum radio galaxies: tracing the evolution of giant ellipticals?