Multi-object spectroscopy with EFOSC - Observations of medium distant clusters of galaxies

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Galactic Clusters, Southern Sky, Stellar Spectrophotometry, Gravitational Lenses, Luminosity, Red Shift, Spectral Bands

Scientific paper

Candidates were selected from a medium deep photographic survey of Abell clusters in the southern hemisphere on the basis of the apparent luminosity of the first ranked object, the diameter (i.e., the compactness), and an estimate of the density enhancement over the expected background. Four superb clusters were observed with EFOSC mounted at the Cassegrain focus of the 3.6 m ESO telescope at La Silla. The image of cluster Cl 1 is a mosaic of CCD frames taken in the V-band. Cluster Cl 2 is regular, rich, compact, and has a triple core.

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