SCG0018-4854: a young and dynamic compact group I. Kinematical analysis
arXiv:0910.4978 · doi:10.1051/0004-6361/200912882
Abstract
Compact groups of galaxies are in particular good laboratories for studying galaxy interactions and their effects on the evolution of galaxies due to their high density and low velocity dispersion. SCG0018-4854 is a remarkably high galaxy density and low velocity dispersion group with evidence of a recent interaction. We obtained VLT FORS2 optical observations and we present spectroscopic and photometric evidence of how dramatically galaxy interactions have affected each of the four member galaxies. We found peculiar kinematics for each galaxy and evidence of recent star formation. In particular, the gas and stellar radial velocity curves of two galaxies are irregular with a level of asymmetry similar to that of other interacting galaxies. We discovered the presence of a bar for NGC 92 therefore revising a previous morphological classification and we obtained spectroscopic confirmation of a galactic-scale outflow of NGC 89. Peculiar kinematics and dynamic consideration lead to a rough estimate of the age of the latest interaction: 0.2-0.7 Gyr, suggesting that SCG0018-4854 is a young and dynamical group.
11 pages, 12 figures, to be published in A&A
References in corpus (9)
- Physical Properties of Wolf-Rayet Stars
- Accretion of gas onto nearby spiral galaxies
- Kinematics of the Narrow-Line Region in the Seyfert 2 Galaxy NGC 1068: Dynamical Effects of the Radio Jet
- Evidence for tidal interaction and merger as the origin of galaxy morphology evolution in compact groups
- Star formation in the intragroup medium and other diagnostics of the evolutionary stages of compact groups of galaxies
- Internal kinematics of modelled interacting disc galaxies
- Optical and radio survey of Southern Compact Groups of galaxies. I. Pilot study of six groups
- Rotation curve bifurcations as indicators of close recent galaxy encounters
- Detection of a hot intergalactic medium in the spiral-only compact group SCG0018-4854
Cited by in corpus (5)
- Local-Group tests of dark-matter Concordance Cosmology: Towards a new paradigm for structure formation
- Star-forming regions and the metallicity gradients in the tidal tails: The case of NGC 92
- Kinematics of galaxies in Compact Groups. Studying the B-band Tully-Fisher relation
- Photometry and Dynamics of the Minor Merger AM1219-430 with Gemini GMOS-S
- The physical properties and the evolution of the interacting system AM1204-292