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We investigate the near‐infrared evolution of brightest cluster galaxies (BCGs) from a sample of rich galaxy clusters since   z ∼ 1 . By employing an X‐ray selection of   L  X  &gt; 10 44  erg s −1  , we limit environmental effects by selecting BCGs in comparably high‐density regions. We find a positive relationship between X‐ray and near‐infrared luminosity for BCGs in clusters with   L  X  &gt; 5 × 10 44  erg s −1  . Applying a correction for this relation, we reduce the scatter in the BCG absolute magnitude by a factor of 30 per cent. The near‐infrared   J − K   colour evolution demonstrates that the stellar population in BCGs has been in place since at least   z = 2 , and that we expect a shorter period of star formation than that predicted by current hierarchical merger models. We also confirm that there is a relationship between ‘blue’  J − K   colour and the presence of BCG emission lines associated with star formation in cooling flows.

Near‐infrared evolution of brightest cluster galaxies in the most X‐ray luminous clusters since z = 1