University of North Dakota Faculty/Staff Newsletter

Physics and Astrophysics colloquium is set for April 23

Physics and Astrophysics will hold a colloquium at 4 p.m. Friday, April 23, in 211 Witmer Hall. The colloquium, titled "Clusters at High Redshift: the Red Sequence Cluster Surveys" will be presented by Erica Ellingson, Astrophysical and Planetary Sciences, University of Colorado at Boulder. Refreshments will be served at 3:30 p.m. in 215 Witmer Hall.

Abstract: Clusters of galaxies and their evolution provide valuable constraints on both cosmological parameters and on environmental effects of galaxy evolution, but finding clusters at high redshift is difficult because they are both faint and rare. The Red Sequence Cluster Surveys (RCS) are a new 100 and 1000 square degree optical surveys which are providing unprecedented samples of new clusters to z~1. The speaker will review the RCS methodology and results from the first RCS-1 survey on the properties of the clusters, cosmological constraints and galaxy evolution.

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