The Interplay of Cluster and Galaxy Evolution |
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| Authors: | RC Nichol ChJ Miller Tomotsugu Goto |
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| Institution: | (1) Dept. of Physics, Carnegie Mellon University, 5000 Forbes Ave., Pittsburgh, PA 15232, USA |
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| Abstract: | We review here the interplay of cluster and galaxy evolution. As a case study, we consider the Butcher-Oemler effect and propose
that it is the result of the changing rate of cluster merger events in a hierarchical universe. This case study highlights
the need for new catalogs of clusters and groups that possess quantified morphologies. We present such a sample here, namely
the Sloan Digital Sky Survey (SDSS) C4 Catalog, which has been objectively-selected from the SDSS spectroscopic galaxy sample.
We outline here the C4algorithm and present first results based on the SDSS Early Data Release, including an X-ray luminosity-velocity
dispersion (Lx-σv) scaling relationship (as a function of cluster morphology) and the density-SFR relation of galaxies within C4 clusters (Gomez et al., 2003). We also discuss the merger of Coma and the NGC4839 group and
its effect on the galaxy populations in these systems. We finish with a brief discussion of a new sample ofHΔ-selected galaxies
(i.e., k+a, post-starburst galaxies) obtained from the SDSS spectroscopic survey.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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