Dynamics of HCGs

Details Dynamics of HCGs Dynamics of HCGs

2002-03-05

arxiv.org/abs/astro-ph/0203066v1

Astronomy and Astrophysics

Astrophysics

Presented in "Galaxies: the Third Dimension", proceedings of a conference held in Cozumel, Mexico, 3-7 December 2001. Organize

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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