The Kinematics of Emission-Line Galaxies in Clusters from ENACS

Details The Kinematics of Emission-Line Galaxies in Clusters from ENACS The Kinematics of Emission-Line Galaxies in Clusters from ENACS

1995-11-13

arxiv.org/abs/astro-ph/9511050v1

Astronomy and Astrophysics

Astrophysics

gzipped postscript file; to appear in the proceedings of the international workshop: "Observational Cosmology: from Galaxies t

Scientific paper

Summary - By using the data from the ESO Nearby Abell Cluster Survey (ENACS), we have studied the properties of emission-line galaxies (ELG) in clusters. The fraction of ELG in clusters is 16~\%; this fraction is slightly dependent on the cluster velocity dispersion, being larger for ``colder'' systems. ELG tend to occur more frequently than other cluster galaxies in substructures. However, only a minor cluster fraction has an ELG population with a mean velocity significantly different from that of the overall cluster population. The velocity distribution of cluster ELG is broader than that of the other cluster galaxies, which translates in a larger observed velocity dispersion. The velocity distribution for ELG in the inner cluster regions suggests that ELG are on mostly radial orbits.

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