Galaxy redshifts in 3 medium–distant clusters^*

¹ Osservatorio Astronomico di Bologna, I–40126 Bologna, Italy
² Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio, I-35122 Padova, Italy

Send offprint request to: A. Cappi

Received: 1 August 1997
Accepted: 15 September 1997

Abstract

We present results from spectroscopic observations of 3 rich and moderately distant galaxy clusters at the 3.6 m ESO telescope at La Silla. We measured 54 galaxy redshifts in 3 fields centered on the clusters A 3663 and A 3889, which are rich and distant ACO clusters, and on a new cluster, Cl , identified on a deep plate. We present estimates of their velocity dispersion and virial mass. Cl  had been noted as a concentration in a poor ACO cluster, S0102, with distance class . We show that Cl  is a more distant cluster, connected to a large scale–structure at .