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Revisiting Brightest Cluster Galaxy Evolution with the Las Campanas Distant Cluster Survey | | Amy E. Nelson
; Anthony H. Gonzalez
; Dennis Zaritsky
; Julianne J. Dalcanton
; | | Date: |
13 Oct 2001 | | Subject: | astro-ph | | Affiliation: | UCSC), Anthony H. Gonzalez (U. Florida), Dennis Zaritsky (U. Arizona), and Julianne J. Dalcanton (U. Washington | | Abstract: | 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 = 2 x 10^{44} ergs/s 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 cluster are best modeled as having a stellar population that formed at large redshift (z_form > 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 z_form > 5 and subsequently passively evolve. We conclude that accretion is proportionally more significant for BCGs in lower mass clusters at these redshifts (factor of 2 to 4 increase in mass since z ~ 1 for the low Lx systems) and that the accreted matter is in the form of systems with evolved stellar populations. | | Source: | arXiv, astro-ph/0110310 | | Services: | Forum | Review | PDF | Favorites | |
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