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For refcode 1994MNRAS.267..665B:
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Copyright by Royal Astronomical Society. 1994MNRAS.267..665B A study of the core of the Shapley Concentration - I. The sample Sandro Bardelli, Elena Zucca, Giampaolo Vettolani, Giovanni Zamorani, Roberto Scaramella, Chris A. Collins and Harvey T. MacGillivray Dipartimento di Astronomia, Universita di Bologna, via Zamboni 33,49126 Bologna, Italy Osservatorio Astronomico, via Zamboni 33,49126 Bologna, Italy Istituto di Radioastronomia/CNR, via Irnerio 46,49126 Bologna, Italy Osservatorio Astronomico di Roma, 69040 Monteporzio Catone, Italy Physics Department, University of Durham, South Road Durham DH1 3LE Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ Accepted 1993 November 4. Received 1993 October 7; in original form 1993 June 21 ABSTRACT We report the first results of a spectroscopic survey of galaxies in the core of the Shapley Concentration, the richest nearby supercluster of clusters of galaxies. We have measured 311 new galaxy redshifts in an area of ~4.5 deg^2^ centred on the Abell cluster A3558. When the data already available in the literature are also considered, the total number of galaxy redshifts in this area amounts to more than 500. On the basis of these data, we estimate the mean velocities and the velocity dispersions of the Abell clusters A3556 and A3558 and the poor cluster SC 1329 - 314. Finally, from an analysis of the projected and three-dimensional distributions of galaxies in this region, we estimate the galaxy overdensity and find that the core of the Shapley Concentration is in an interesting, very complex dynamical state: the main clusters appear to be interacting with each other, forming a single elongated structure containing many subcondensations. Key words: galaxies: distances and redshifts - galaxies: clusters: individual: Shapley Concentration - large-scale structure of Universe.
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