Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-16771
Kautsch, S J; Gonzalez, A H; Soto, C A; Tran, K V H; Zaritsky, D; Moustakas, J (2008). Forming early-type galaxies in groups prior to cluster assembly. Astrophysical Journal Letters, 688(1):L5-L8.
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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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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Institute for Computational Science|
|Deposited On:||06 Mar 2009 09:29|
|Last Modified:||27 Nov 2013 20:35|
|Publisher:||Institute of Physics Publishing|
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