Structural and Dynamical Analysis of the Hickson Compact Groups

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Abstract

Based on the spectroscopic survey of de Carvalho et al., we analyze the structural and dynamical properties of 17 Hickson compact groups. This analysis probes a region of 05 × 05 around each group and shows that most of them are part of larger structures. Our results also suggest that the Hickson sample is composed of different dynamical stages of the groups" 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.

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