Interaction Patterns in a Complete Sample of Compact Groups
Applying an automatic code to the 3D UZC galaxy catalogue, we have extracted a complete sample of about 400 physical compact groups having cz≤10000 km/s and at least 3 member galaxies within a projected distance radius of 200 h −1 kpc. We find interaction pattern to be more common among triplets than among higher multiplicity compact groups, which nicely matches predictions based on the lower velocity dispersion and higher overdensity displayed by triplets. Whilst morphological disturbance are rather common among CG members, we retrieve a relative low fraction of AGNs. Interestingly only Seyfert 2 are retrieved, thus confirming once more that locally dense environments discriminate against Seyfert 1.
KeywordsCompact Groups Environment Morphological parameters Seyfert
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