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Date and Time of the Query: 2019-07-21 T04:18:35 PDT
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For refcode 2008ApJ...688L...5K:
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2008ApJ...688L...5K Forming Early-Type Galaxies in Groups Prior to Cluster Assembly Kautsch, Stefan J.; Gonzalez, Anthony H.; Soto, Christian A.; Tran, Kim-Vy H.; Zaritsky, Dennis; Moustakas, John 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. Key words: Galaxies: Clusters: General, Galaxies: Elliptical and Lenticular, cD, Galaxies: Evolution, Galaxies: Interactions, Galaxies: Spiral, Galaxies: Structure
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