Galaxy evolution in overdense environments at high redshift: passive early-type galaxies in a cluster at redshift 2
- Strazzullo, V.
- Gobat, R.
- Daddi, Emanuele
- Onodera, M.
- Carollo, M.
- Dickinson, M.
- Renzini, A.
- Arimoto, N.
- Cimatti, Alessandro
- Finoguenov, A.
- Chary, R. -R.
DOIAbstract
17 pages, 13 figures, ApJ in pressInternational audienceWe present a study of galaxy populations in the central region of the IRAC-selected, X-ray detected galaxy cluster Cl J1449+0856 at z=2. Based on a sample of spectroscopic and photometric cluster members, we investigate stellar populations and morphological structure of cluster galaxies over an area of ~0.7Mpc$^2$ around the cluster core. The cluster stands out as a clear overdensity both in redshift space, and in the spatial distribution of galaxies close to the center of the extended X-ray emission. The cluster core region (r<200 kpc) shows a clearly enhanced passive fraction with respect to field levels. However, together with a population of massive passive galaxies mostly with ear...
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