The birthplace of compact groups of galaxies

Details The birthplace of compact groups of galaxies The birthplace of compact groups of galaxies

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107.1623r&link_type=abstract

The Astronomical Journal, vol. 107, no. 5, p. 1623-1628

Computer Science

Numerical Analysis

73

Astronomical Models, Birth, Collapse, Compact Galaxies, Red Shift, Universe, Computerized Simulation, Many Body Problem, Numerical Analysis, Velocity Distribution

Scientific paper

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. (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.

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