Mass Distribution in Hickson Compact Groups of Galaxies

Abstract

This study presents the mass distribution for a sample of 18 late-type galaxies in nine Hickson Compact Groups. We used rotation curves from high resolution 2D velocity fields of Fabry-Perot observations and J-band photometry from the 2MASS survey, in order to determine the dark halo and the visible matter distributions. The study compares two halo density profile, an isothermal core-like distribution and a cuspy one. We also compare their visible and dark matter distributions with those of galaxies belonging to cluster and field galaxies coming from two samples: 40 cluster galaxies of Barnes et al (2004) and 35 field galaxies of Spano et al. (2008). The central halo surface density is found to be constant with respect to the total absolute magnitude similar to what is found for the isolated galaxies. This suggests that the halo density is independent to galaxy type and environment. We have found that core-like density profiles fit better the rotation curves than cuspy-like ones. No major differences have been found between field, cluster and compact group galaxies with respect to their dark halo density profiles.

35 pages, 21 figures. Accept for publication in Astronomical Journal

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• The universal rotation curve of dwarf disk galaxies
• Scaling Laws for Dark Matter Halos in Late-Type and Dwarf Spheroidal Galaxies
• The universal rotation curve of low surface brightness galaxies IV: the interrelation between dark and luminous matter
• The Tully-Fisher relations for Hickson Compact Group galaxies
• Dark matter halos in the multicomponent model. II. Density profiles of galactic halos
• Tensorial solution of the Poisson equation and the dark matter amount and distribution of UGC 8490 and UGC 9753