Compact Groups of Galaxies selected by stellar mass: The 2MASS Compact Group Catalogue
E. Diaz-Gimenez (1,2,3), G. A. Mamon (4), M. Pacheco (1), C. Mendes de, Oliveira (3), M. V. Alonso (1,2) ((1) IATE (CONICET), Cordoba, Argentina,, (2) OAC (UNC), Cordoba, Argentina, (3) IAG, Sao paulo, Brazil, (4) IAP,, Paris, France)

TL;DR
This paper introduces a new, large catalogue of compact galaxy groups selected by stellar mass from the 2MASS survey, providing a valuable resource for studying galaxy interactions and mergers.
Contribution
It presents the first compact galaxy group catalogue based on stellar mass, with well-defined selection criteria and velocity filtering, and compares properties with models and previous samples.
Findings
Largest velocity-filtered compact group sample to date.
Significant signs of mergers and centrally located brightest galaxies.
Higher space density than previous Hickson sample.
Abstract
We present a photometric catalogue of compact groups of galaxies (p2MCGs) automatically extracted from the 2MASS extended source catalogue. A total of 262 p2MCGs are identified, following the criteria of Hickson (1982), of which 230 survive visual inspection. Only 1/4 of these groups were previously known compact groups (CGs). Among the 144 p2MCGs that have all their galaxies with known redshifts, 85 have 4 or more accordant galaxies. This v2MCG sample of velocity-filtered p2MCGs constitutes the largest sample of CGs catalogued to date, with both well-defined selection criteria and velocity filtering, and is the first CG sample selected by stellar mass. We compared the properties of the 78 v2MCGs with <v> > 3000 km/s with the properties of other CG samples, as well as those (mvCGs) extracted from the semi-analytical model of Guo et al. (2011) run on the high-resolution Millennium-II…
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