Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-10-03
Astronomy and Astrophysics
Astrophysics
5 pages, 2 figures, 2 tables. Accepted for publication in ApJ Letters
Scientific paper
10.1086/593978
We study a unique proto-cluster 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 comprised 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 pre-processing in the group environment playing the dominant role in establishing the observed early-type fraction in galaxy clusters.
Gonzalez Anthony H.
Kautsch Stefan J.
Moustakas John
Soto Christian A.
Tran Kim-Vy H.
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