THE CL-2236-04 LENS CLUSTER - LOOKING FOR A 3RD GRAVITATIONAL IMAGE

We present deep imaging and spectroscopy of three blue objects in the Cl2236-04 cluster-lens which follow-up the discovery of a bright are i n the center of the cluster (Melnick et al., 1993), and the model of t he matter distribution of this lens (Kneib et al., 1993). The redshift measured for the predicted counter-image of the are is found to be z = 1.334 instead of z = 1.116 observed for the are. This proves that th ese are not multiple images of the same source. A new model is present ed. The source of the are is reconstructed and shows a bimodal shape, resembling two merging galaxies. This explains the velocity gradient s een in the are and allows us to predict the redshifts of some of the a rclets detected in the cluster.