A&A Supplement series, Vol. 129, April I 1998, 31-40

Received August 1; accepted September 15, 1997

Galaxy redshifts in 3 medium-distant clusters

A. Cappi, E.V. Held, and B. Marano

Send offprint request: A. Cappi

  Osservatorio Astronomico di Bologna, I-40126 Bologna, Italy
e-mail: cappi@astbo3.bo.astro.it, marano@astbo3.bo.astro.it

  Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio, I-35122 Padova, Italy
e-mail: held@astrpd.pd.astro.it

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 (R=2) and distant (D=6) ACO clusters, and on a new cluster, Cl 0053-37, identified on a deep plate. We present estimates of their velocity dispersion and virial mass. Cl 0053-37 had been noted as a concentration in a poor ACO cluster, S0102, with distance class D=4. We show that Cl 0053-37 is a more distant cluster, connected to a large scale-structure at .

keywords: galaxies: clusters of -- distances and redshifts -- cosmology: observations -- galaxies: clusters: Cl 0053-37; A 3663; A 3889

• 1. Introduction
• 2. The clusters
• 3. Observations and data reduction
• 4. Results
• 5. A supercluster at  0.165?
• 6. Summary
• References