2003/01/07 by S. Temporin, R. Weinberger, G. Galaz +1
Physics and Astronomy · #Astronomy and Astrophysical Research #Galaxies: Formation, Evolution, Phenomena #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/368340
published as Astrophys.J. 587 (2003) 660-671 · Accepted for publication in the Astrophysical Journal
arxiv created 2003/01/07 · openalex publication_date 2003/04/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01
This is the second part of a detailed study of the ultracompact group CG J1720-67.8. In the first part we focused attention on the three main galaxies of the group and identified a number of candidate tidal dwarf galaxies (TDGs). Here we concentrate on these candidate TDGs. Absolute photometry of these objects in BVRJHK s bands confirms their relatively blue colors, as we already expected from the inspection of optical and near-infrared color maps and from the presence of emission lines in the optical spectra. The physical conditions in such candidate TDGs are investigated through the application of photoionization models, while the optical colors are compared with grids of spectrophotometric evolutionary synthesis models from the literature. Although from our data self-gravitation cannot be proved for these objects, their general properties are consistent with those of other TDG candidates. In addition, we present the photometry of a few "knots" detected in the immediate surroundings of CG J1720-67.8 and consider the possibility that these objects might belong to a dwarf population associated with the compact group.