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We report radial velocities for 99 galaxies with projected positions within30 arcmin of the center of the cluster A3733 obtained with the MEFOS multifiberspectrograph at the 3.6-m ESO telescope. These measurements are combined with39 redshifts previously published by Stein (1996) to built a collection of 112galaxy redshifts in the field of A3733, which is used to examine the kinematicsand structure of this cluster. We assign cluster membership to 74 galaxies withheliocentric velocities in the interval 10500-13000 km/s. From this sample ofcluster members, we infer a heliocentric systemic velocity for A3733 of11653{+74}{-76} km/s, which implies a mean cosmological redshift of 0.0380, anda velocity dispersion of 614{+42}{-30} km/s. The application of statisticalsubstructure tests to a magnitude-limited subset of the latter sample revealsevidence of non-Gaussianity in the distribution of ordered velocities in theform of lighter tails and possible multimodality. Spatial substructure tests donot find, however, any significant clumpiness in the plane of the sky, althoughthe existence of subclustering along the line-of-sight cannot be excluded.Comment: AA-LaTeX2e style; 10 pages, 2 Postscript figures, Table 1 appended.  To be published in Astronomy and Astrophysics. Also available at  ftp://pcess1.am.ub.es/pub/AA/a3733.ps.g

Kinematics of the southern galaxy cluster Abell 3733