Paper:	Compact Groups of Galaxies: Small, Dense, and Elusive
Volume:	421, Galaxies in Isolation: Exploring Nature Versus Nurture
Page:	279
Authors:	Pompei, E.; Iovino, A.
Abstract:	We have conducted two surveys of compact groups of galaxies in the Southern emisphere, one at z ≤ 0.03 and another at 0.05 ≤ z ≤ 0.2, with the aim of studying the evolution of the group member galaxies and the groups themselves. Most of the observed targets are physically bound structures with a high density on the sky and a crossing time τ ≤ 1 Gyr. We conclude that either compact groups are stabilized somehow by their dark matter halo or that we observed two distinct generations of compact groups.

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