Astrophys. J., 566, 103-122 (2002/February-2)
Revisiting brightest cluster galaxy evolution with the Las Campanas distant cluster survey.
NELSON A.E., GONZALEZ A.H., ZARITSKY D. and DALCANTON J.J.
Abstract (from CDS):
We investigate the influence of environment on brightest cluster galaxy (BCG) evolution using a sample of 63 clusters at 0.3≤z≤0.9 drawn primarily from the Las Campanas Distant Cluster Survey and follow-up V, I, and K' photometry. The luminosity evolution of the entire BCG sample is not adequately described by a single evolutionary model. Using the integrated light from the cluster detection as a proxy for cluster LX and the suggestion by Burke, Collins, & Mann, we set LX=2x1044 ergs.s–1 to be the division between high- and low-luminosity clusters. At high redshift (z>0.6) BCGs from low-LX clusters are fainter, on average, than those from high-LX clusters and are best modeled as having constant luminosity with redshift. The BCGs from high-LX clusters are best modeled as having a stellar population that formed at large redshift (zform>5) and is passively evolving. However, for the entire BCG population, the observed V-I and I-K' colors are well described by a single evolutionary model in which the stellar populations have zform>5 and subsequently passively evolve. We conclude that accretion is proportionally more significant for BCGs in lower mass clusters at these redshifts (a factor of 2-4 increase in mass since z∼1 for the low-LX systems; Aragon-Salamanca and coworkers) and that the accreted matter is in the form of systems with evolved stellar populations.
Galaxies: Clusters: General - Galaxies: Elliptical and Lenticular, cD - Galaxies: Evolution - Galaxies: Formation - Galaxies: High-Redshift - Surveys
VizieR on-line data:
<Available at CDS (J/ApJ/566/103): table1.dat table2.dat>
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