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For refcode 1994AJ....107.1623R:
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1994AJ....107.1623R THE BIRTHPLACE OF COMPACT GROUPS OF GALAXIES MASSIMO RAMELLA Osservatotio Astronomico di Trieste, Via G. B. Tiepolo 11,34131 Trieste and Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 Electronic mail: ramella@cfa.harvard.edu, 38439::RAMELLA ANTONALDO DIAFERIO Universita di Milano, Dipartimento di Fisica, Va Celoria 16,20133 Milano and Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 Electronic mail: diaferio@cfa.harvard.edu MARGARET J. GELLER AND JOHN P. HUCHRA Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 Electronic mail: mjg@ca.harvard.edu, huchra@cfa.harvard.edu Received 1993 July 8; revised 1993 December 27 ABSTRACT We use complete redshift surveys to study the redshift neighborhoods of 38 Hickson compact groups (HCGs). Twenty-nine of these HCGs (76%) are embedded in rich looser systems which we call HCG associations. Analysis of the redshift neighborhood of HCGs outside the CfA survey suggests that most HCGs are embedded in more extended physical systems. Rich loose groups extracted from the CfA survey [Ramella et al. in preparation (1994)) have physical properties similar to those of the HCG associations. These rich loose groups often contain compact configurations. N-body experiments (Diaferio et al., AJ, 107, 868(1994)] suggest that compact configurations analogous to HCGs form continually during the collapse of rich loose groups. These observational and numerical results suggest that rich loose groups are the birthplace of HCGs.
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