Compact Groups in the UZC galaxy sample: II. Connections between morphology, luminosity and large-scale density

Abstract

The nature of Compact Groups (CGs) is investigated by comparing the luminosities and morphologies of CG galaxies, CG Neighbours and Isolated galaxies. CGs turn out to include more early type galaxies than Isolated galaxies and fewer low-luminosity galaxies. The 33 CGs with a dominant E/S0 and the 30 CGs with a dominant spiral have similar LF parameters. Spiral dominated CGs have fewer galaxies at high and low luminosity in comparison with their Neighbours, while E-S0 dominated CGs seem to lack only faint galaxies when compared to their Neighbours. Ellipticals which are the dominant galaxy of a CG are also brighter than all their Neighbours, while this holds true for only half of the dominant spirals and S0s. Relations linking the number of Neighbours of dominant E-S0s to the luminosity of E-S0s and to the difference between the first and the second ranked CG members do suggest a link between the formation of bright early-type galaxies and the presence of a group-like potential. No similar relations are found for dominant spirals. These tentative results are compatible with the assumption that CG dominant Ellipticals are anomalous galaxies whose formation might have been a secondary outcome during the process of groups formation.

12 pages, 9 figures, A&A, accepted

References in corpus (11)

• The nature and space density of fossil groups of galaxies
• An X-ray Atlas of Groups of Galaxies
• The morphology-density relation in X-ray bright galaxy groups
• The ESO-Sculptor Survey: Luminosity functions of galaxies per spectral type at redshifts 0.1-0.5
• X-ray bright groups and their galaxies
• Morphology and luminosity segregation of galaxies in nearby loose groups
• The detection of diffuse emission in HCG 16 with XMM-Newton
• Seyfert galaxies in UZC-Compact Groups
• The Role of a Hot Gas Environment on the Evolution of Galaxies
• Galaxy groups in the 2dF galaxy redshift survey: A Compactness Analysis of Groups
• Nature and Environment of Very Luminous Galaxies

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• Properties of Hickson Compact Groups and of the Loose Groups within which they are Embedded
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• The Relation between Morphology and Dynamics of Poor Groups of Galaxies
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• Compact groups of galaxies in GAMA -- Probing the densest minor systems at intermediate redshifts
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