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Title:
Forming Early-Type Galaxies in Groups Prior to Cluster Assembly
Authors:
Kautsch, Stefan J.; Gonzalez, Anthony H.; Soto, Christian A.; Tran, Kim-Vy H.; Zaritsky, Dennis; Moustakas, John
Affiliation:
AA(Department of Astronomy, University of Florida, Gainesville, FL 32611-2055.), AB(Department of Astronomy, University of Florida, Gainesville, FL 32611-2055.), AC(Department of Astronomy, University of Florida, Gainesville, FL 32611-2055.), AD(Institute for Theoretical Physics, Universität Zürich, CH-8057 Zürich, Switzerland.), AE(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AF(Center for Cosmology and Particle Physics, New York University, 4 Washington Place, New York, NY 10003.)
Publication:
The Astrophysical Journal, Volume 688, Issue 1, pp. L5-L8. (ApJL Homepage)
Publication Date:
11/2008
Origin:
UCP
ApJ Keywords:
Galaxies: Clusters: General, Galaxies: Elliptical and Lenticular, cD, Galaxies: Evolution, Galaxies: Interactions, Galaxies: Spiral, Galaxies: Structure
DOI:
10.1086/593978
Bibliographic Code:
2008ApJ...688L...5K

Abstract

We study a unique protocluster of galaxies, the supergroup SG1120-1202. We quantify the degree to which morphological transformation of cluster galaxies occurs prior to cluster assembly in order to explain the observed early-type fractions in galaxy clusters at z = 0. SG1120-1202 at z~0.37 is composed of four gravitationally bound groups that are expected to coalesce into a single cluster by z = 0. Using HST ACS observations, we compare the morphological fractions of the supergroup galaxies to those found in a range of environments. We find that the morphological fractions of early-type galaxies (~60%) and the ratio of S0 to elliptical galaxies (0.5) in SG1120-1202 are very similar to clusters at comparable redshift, consistent with preprocessing in the group environment playing the dominant role in establishing the observed early-type fraction in galaxy clusters.
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