Compact group modeling

Details Compact group modeling Compact group modeling

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992daec.conf...51m&link_type=abstract

In Distribution of Matter in the Universe, 2nd DAEC mtg, ed. G.A. Mamon and D. Gerbal (Meudon: Obs. de Paris) p. 51-66

Physics

12

Scientific paper

I review here the debate on the nature of compact groups of galaxies: are the compact groups catalogued by Hickson physically dense systems or are they caused by chance alignments within larger systems? Results of recent N-body simulations of loose groups are analyzed, showing that only 10% of compact configurations seen in projection are three dimensional dense systems (of which roughly half are bound), whereas the remaining 90% are one dimensional chance alignments. Moreover, these chance alignments turn out to be binary-rich (with a small fraction of triplets too). The arguments reviewed here and these last two results suggest that rather than being dense quartets and quintets, most compact groups are binary-rich chance alignments within larger systems, thus providing a natural explanation to the high level of physical interactions seen in compact groups. Moreover, it is suggested that the most distant compact groups may represent the bright-ends of rich evolved clusters.

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