The role of environment in the morphological transformation of galaxies in 9 intermediate redshift clusters

Details The role of environment in the morphological transformation of galaxies in 9 intermediate redshift clusters The role of environment in the morphological transformation of galaxies in 9 intermediate redshift clusters

2009-07-22

arxiv.org/abs/0907.3905v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

A&A in press

Scientific paper

[abridged] We analyze a sample of 9 massive clusters at 0.49.5). We find that the red sequence is already in place at z~0.5 and it is mainly composed of very massive (log(M/Msol)>11.3) early-type galaxies. These massive galaxies seem to be already formed when they enter the cluster, probably in infalling groups, since the fraction remains constant with the cluster radius. Their presence in the cluster center could be explained by a segregation effect reflecting an early assembly history. Any evolution that takes place in the galaxy cluster population occurs therefore at lower masses (10.3

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