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ACKS Seminar: Dave Spiegel (Columbia University)
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ACKS Seminar: Anja von der Linden (KIPAC, Stanford University)
| What | ACKS |
|---|---|
| When |
12 June 08 from 03:00 pm to 04:00 pm |
| Where | SLAC, 3rd Floor KAVLI Conf Room |
| Contact Name | Lukasz Stawarz |
| Contact Email | stawarz@slac.stanford.edu |
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Zoology of Cluster Galaxies
Galaxies are observed mainly in two flavors: spiral galaxies with active star formation, and elliptical galaxies with little active star formation. This galaxy bimodality is a function both of galaxy mass, as well as of environment, with cluster galaxies having lower levels of star formation, and being more likely to be ellipticals. I will review these phenomenological concepts, and the physical mechanisms that have been proposed to account for the environmental dependence. I will then present an analysis of the star formation properties of cluster galaxies in a sample of 500 clusters drawn from the Sloan Digital Sky Survey. These data suggest that star formation in cluster galaxies is shut off on relatively slow timescales.
MASS: Paul Simeon