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On the Nature of Compact Groups of Galaxies

Published online by Cambridge University Press:  12 April 2016

Reinaldo R. de Carvalho
Reinaldo R. de Carvalho*
Affiliation:
Observatório National / MCT - Rio de Janeiro, CEP 20921-400, Brazil

Abstract

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Based on the spectroscopic survey of de Carvalho et al. (1997), we analyse the structural and dynamical properties of 17 Hickson Compact Groups (HCG). This analysis probes a region of 0.5° × 0.5° around each group and shows that most are part of larger structures. Our results also suggest that the Hickson sample is composed of different dynamical stages of the group’s evolution. Specifically, we identify three possible evolutionary phases among groups in the sample: loose groups, [core+halo] systems and compact groups, each one presenting a distinct surface density profile. This sequence is consistent with the replenishment scenario for the formation and evolution of compact groups within larger and less dense systems.

Type
Part 2. Properties of Small Groups
Information
International Astronomical Union Colloquium , Volume 174: Small Galaxy Groups , 2000 , pp. 239 - 244
Copyright
Copyright © Astronomical Society of the Pacific 2000

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