Abstract
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 LX > 1044erg 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 LX > 5 × 1044erg 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.
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