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We present a study of galaxy populations in the central region of theIRAC-selected, X-ray detected galaxy cluster Cl J1449+0856 at z=2. Based on asample of spectroscopic and photometric cluster members, we investigate stellarpopulations and morphological structure of cluster galaxies over an area of~0.7Mpc^2 around the cluster core. The cluster stands out as a clearoverdensity both in redshift space, and in the spatial distribution of galaxiesclose 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 fieldlevels. However, together with a population of massive passive galaxies mostlywith early-type morphologies, it also hosts massive actively star-forming,often highly dust-reddened sources. Close to the cluster center, amulti-component system of passive and star-forming galaxies could be the futureBCG still assembling. We observe a clear correlation between passive stellarpopulations and an early-type morphology, in agreement with field studies atsimilar redshift. Passive early-type galaxies in this clusters are typically afactor 2-3 smaller than similarly massive early-types at z~0, but also onaverage larger by a factor ~2 than their field analogs at z~2, lending supportto recent claims of an accelerated structural evolution in high-redshift denseenvironments. These results point towards the early formation of a populationof massive galaxies, already evolved both in their structure and stellarpopulations, coexisting with still-actively forming massive galaxies in thecentral regions of young clusters 10 billion years ago.

Galaxy evolution in overdense environments at high redshift: passive early-type galaxies in a cluster at redshift 2