Title:

The Infall Regions of Galaxy Clusters



Ken Rines
YCAA Prize Postdoctoral Fellow
Yale University




Abstract:

Galaxy clusters are surrounded by infall regions where galaxies
are bound to the cluster but are not yet virialized.  I will
discuss a new kinematic technique that measures the masses of
these infall regions to radii of 5-10 Mpc.  Combining these mass
profiles with 2MASS photometry, we find that the mass-to-light
ratio varies with scale.  This result arries important
implications for cosmology and/or galaxy formation.  Finally,
the wide range of environments found in cluster infall regions
can be used to test models of galaxy evolution.