Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxac..26..105m&link_type=abstract
XI IAU Regional Latin American Meeting of Astronomy (Eds. L. Infante & M. Rubio) Revista Mexicana de Astronomía y Astrofísica (S
Astronomy and Astrophysics
Astronomy
3
Galaxies: Clusters, Galaxies: Kinematics And Dynamics, Galaxies: Structure
Scientific paper
We report on optical observations of a few of the most evolved nearby compact groups of galaxies known, HCG 31, HCG 79 and HCG 92, and on the properties of two fossil groups at z ˜ 0.137, RX1416.4+2315 and RX1552.2+2013. Although little is known about the optical properties of fossil groups, it has been suggested that they could be the end-products of compact groups. In this paper the possible connection compact group - fossil group is discussed. The most evolved compact groups of galaxies observed, which display a wealth of interacting features and are thought to be about to merge (such as HCG 31, for an example) are spiral rich and are probably NOT the precursors of fossil groups, given their low velocity dispersions and poor neighborhoods. Instead, high velocity dispersion compact groups, which contain mainly bright elliptical galaxies and are rich in low-luminosity companions (groups resembling HCG 62, for an example) may have been the precursors of fossil groups, at early times.
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