SIMBAD references

We measured the radial velocities of 265 galaxies in the field of 52 clusters in the redshift range 0.05<z<0.25. In a 93% complete sample of galaxies close to the brightest cluster members (BCMs; d<40 kpc) we found that the percentage (43±9%) of galaxies with |dV|<300 km.s^–1 is higher than the one (28±4%) of a control sample of more distant galaxies. Moreover, we found that the velocity dispersion (576⁺⁶⁸_–77 km.s^–1) of the galaxies in the inner sample is lower than the one (866⁺⁵²_–55 km.s^–1) of the control sample. The sample's velocity dispersion is also lower than the expectation from the fit of the velocity dispersion profile of all data combined in a pseudocluster with dynamical models of the cluster mass distribution. We discuss these results in the light of the existence of a bound population of galaxies that will eventually merge with the BCM as a general feature of clusters of galaxies.