Abstract / Description of output
We examine the central galaxy luminosity-host halo mass relation for 54 brightest group galaxies (BGGs) and 92 brightest cluster galaxies (BCGs) at z <0.1 and present the first measurement of this relation for a sample of known BCGs at . At z <0.1 we find LK ~ M0.24+/-0.08200 for the BCGs and the early-type BGGs in groups with extended X-ray emission and LK ~ M0.11+/-0.10200 for the BCGs alone. At 0.1 <z <0.8 we find LK ~ M0.28+/-0.11200. We conclude that there is no evidence for evolution in this relationship between z <0.1 and z <0.8: BCG growth appears to still be limited by the time-scale for dynamical friction at these earlier times, not proceeding according to the predictions of present semi-analytic models.