The ESO Nearby Abell Cluster Survey: Kinematics of Galaxies in Clusters

Details The ESO Nearby Abell Cluster Survey: Kinematics of Galaxies in Clusters The ESO Nearby Abell Cluster Survey: Kinematics of Galaxies in Clusters

1998-10-30

arxiv.org/abs/astro-ph/9810501v1

Astronomy and Astrophysics

Astrophysics

13 pages, 6 figures, to appear in the proceedings of 'Observational Cosmology: The Developments of Galaxy Systems', Sesto 1998

Scientific paper

We summarize several results based on the velocity data-set for cluster galaxies provided by ENACS (the ESO Nearby Abell Cluster Survey). We describe the distribution of velocity dispersions of a complete sample of rich galaxy clusters, and compare it to the distribution of cluster X-ray temperatures, and with predictions of theoretical models. We then address the issue of the existence of a Fundamental Plane (FP) for rich clusters, first suggested by Schaeffer et al. We confirm the existence of this FP with the ENACS data-set. The cluster FP is different from the FP of elliptical galaxies, and from the virial prediction. Some implications of the cluster FP are discussed. Finally, we describe the phase-space distributions of different populations of cluster galaxies. Different galaxy classes are defined according to their morphological or spectral type, and the presence of emission-lines. Star-forming (late-type) galaxies have a velocity dispersion profile that (in combination with their wider spatial distribution) is suggestive of first infall into the cluster. On the contrary, quiescent (early-type) galaxies show evidence of a dynamically relaxed distribution.

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