Dynamics of Hickson Compact Groups of Galaxies

Details Dynamics of Hickson Compact Groups of Galaxies Dynamics of Hickson Compact Groups of Galaxies

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aspc..282..262t&link_type=abstract

Galaxies: The Third Dimension, ASP Conference Proceedings, Vol. 282. Edited by Margarita Rosado, Luc Binette, and Lorena Arias.

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Scientific paper

It is shown that compact groups of galaxies (HCGs, ShCGS) are stable formations, in which principal member galaxies together with faint galaxies in their environment rotate in elongated orbits around the common gravitational center of the group. Hence, the multitude of puzzles related to CGs: the very existence of CGs, absence of strong radio sources, absence of strong signs of interaction and merging, the fact that elliptical members (the best candidates for ongoing merging) are not more frequently first-ranked than spirals, etc., are solved. The number of such groups, may be much higher in the near Universe, since only those of them, the elongation of which is oriented close to the line of sight, or bright members of which happen to be close to each other during regular rotation, are detected as the so-called compact groups.

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