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The birthplace of compact groups of galaxiesWe 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. (1994)) have physical properties similar to those of the HCG associations. These rich loose groups often contain compact configurations. N-body experiments (Diaferio (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.
Document ID
19950032478
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Ramella, Massimo
(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA United States)
Diaferio, Antonaldo
(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA United States)
Geller, Margaret J.
(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA United States)
Huchra, John P.
(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA United States)
Date Acquired
August 16, 2013
Publication Date
May 1, 1994
Publication Information
Publication: The Astronomical Journal
Volume: 107
Issue: 5
ISSN: 0004-6256
Subject Category
Astronomy
Accession Number
95A64077
Funding Number(s)
CONTRACT_GRANT: NAGW-201
Distribution Limits
Public
Copyright
Other

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