Reflections of Cluster Assembly in the Stellar Populations and Dynamics of Member Galaxies

Details Reflections of Cluster Assembly in the Stellar Populations and Dynamics of Member Galaxies Reflections of Cluster Assembly in the Stellar Populations and Dynamics of Member Galaxies

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20918303m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #183.03; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We combine space-based optical (HST) and UV (GALEX) imaging of two intermediate redshift galaxy clusters with ground-based (Keck) spectroscopy of member galaxies, to study the relation between the formation history of cluster galaxies and the assembly history of the cluster structure itself. We examine galaxy morphologies, dynamics, and stellar populations as a function of several measures of environment.
We find that galaxies in the cluster MS0451-03 (z=0.54) exhibit a markedly lower incidence of recent star formation activity than galaxies in the cluster Cl0024+17 (z=0.39), despite the higher redshift of MS0451. This effect is significant even in the cluster outskirts, more than 2.5 Mpc from each cluster's core. We find a corresponding increase in the fraction of "passive", non-star forming spiral galaxies in MS0451, as compared to Cl0024. These passive spirals show signs that their star formation has recently been quenched. Without further star formation, they will likely evolve into S0 galaxies.
The comparatively evolved state of MS0451, with look back time more than 1 Gyr higher than Cl 0024, implies a large cosmic variance in the properties of massive galaxy clusters, and underscores the role of environment in galaxy formation. Specifically, we quantify the roles of assembling substructure and the ICM in governing the star formation histories of cluster galaxies.

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