AAS 205th Meeting, 9-13 January 2005
Session 157 Cluster of Galaxies and Dark Matter
Oral, Thursday, January 13, 2005, 10:00-11:30am, Pacific 2/3

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[157.04] Mass and Light in Galaxy Clusters

K. Blindert, H. K. C. Yee (U. Toronto), M. D. Gladders (Carnegie Observatories), E. Ellingson (U Colorado at Boulder), J. Golding (Dept. Astronomy, U. Toronto)

Detailed studies of galaxy clusters are used to test a variety of scenarios, from galaxy evolution to dark matter halo structure. However, most studies are confined to very massive systems. To overcome this issue, we have undertaken a spectroscopic follow-up survey to the highly successful Red-sequence Cluster Survey (RCS). For this survey about forty RCS clusters were selected, at low to moderate redshift and in a wide range of cluster mass, for multi-object spectroscopy with CFH-MOS and the LDSS2 on Magellan. Over 8000 spectra were obtained, yielding redshifts for roughly 1750 cluster members. I will present some first results of this follow-up survey, including the dependence of cluster mass-to-light ratio on total cluster mass, and a comparison of the mass profiles of low- and high-mass clusters.

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© 2004. The American Astronomical Society.