Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105.1058f&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 691, p. 1058-1062.
Astronomy and Astrophysics
Astronomy
46
Cosmology, Galactic Clusters, Galactic Evolution, Galactic Mass, Kinematics, Red Shift, Constraints, Galactic Rotation, Radial Velocity
Scientific paper
The first observations of central velocity dispersions are presented for galaxies in the rich cluster Abell 665 at z = 0.18. Full curves of radial velocity, and velocity dispersion of cluster members are presented. The measurements result in a well-defined Faber-Jackson relation for the red cluster members. A blue galaxy is lying 2.2 mag off the relation, and has an 'E+A' spectrum. This 'Butcher-Oemler' galaxy is rotating rapidly, which is indicative of a strong disk. The observations show that measurements of central velocity dispersions are possible with current telescope capabilities. Observations at higher redshifts will lead to new constraints on both galaxy evolution and cosmology.
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