On the age-radius relation and orbital history of cluster galaxies

Details On the age-radius relation and orbital history of cluster galaxies On the age-radius relation and orbital history of cluster galaxies

2004-06-28

arxiv.org/abs/astro-ph/0406615v1

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings of IAU Colloquium 195: "Outskirts of galaxy clusters: intense life in the suburbs", Torino, Italy

Scientific paper

10.1017/S1743921304001127

We explore the region of influence of a galaxy cluster using numerical simulations of cold dark matter halos. Many of the observed galaxies in a cluster are expected to be infalling for the first time. Half of the halos at distances of one to two virial radii today have previously orbited through the cluster, most of them have even passed through the dense inner regions of the cluster. Some halos at distances of up to three times the virial radius have also passed through the cluster core. We do not find a significant correlation of ``infall age'' versus present day position for substructures and the scatter at a given position is very large. This relation may be much more significant if we could resolve the physically overmerged galaxies in the central region.

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