Deconstructing the Antlia cluster core
  The present literature does not give a satisfactory answer to the question
about the nature of the "Antlia galaxy cluster". The radial velocities of
galaxies found in the region around the giant ellipticals NGC 3258/3268 range
from about 1000 km/s to 4000 km/s. We characterise this region and its possible
kinematical and population substructure. We have obtained VLT--VIMOS
multi-object spectra of the galaxy population in the inner part of the Antlia
cluster and measure radial velocities for 45 potential members. We supplement
our galaxy sample with literature data, ending up with 105 galaxy velocities.
We find a large radial velocity dispersion for the entire sample as reported in
previous papers. However, we find three groups at about 1900 km/s, 2800 km/s,
and 3700 km/s, which we interpret as differences in the recession velocities
rather than peculiar velocities. The high radial velocity dispersion of
galaxies in the Antlia region reflects a considerable extension along the line
of sight.
