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- Title
Mass-to-light ratios for galaxy pairs and triplets in various environments.
- Authors
Melnik, O.; Elyiv, A.; Vavilova, I.
- Abstract
We have estimated the dark matter content in galaxy pairs and triplets selected from SDSS DR5 by a higher-order Voronoi tesseleration method. Specifically, the median mass-to-light ratios Mvir/ L are 12 M⊙/ L⊙ for isolated pairs, 44 M⊙/ L⊙ for isolated triplets, and 7 (8) M⊙/ L⊙ for compact pairs (triplets) with a characteristic distance between the galaxies of R < 50 (100) kpc. We show that the less isolated a system, the larger its mass-to-light ratio. This suggests that galaxy groups in a denser environment have a higher velocity dispersion.
- Publication
Kinematics & Physics of Celestial Bodies, 2009, Vol 25, Issue 1, p43
- ISSN
0884-5913
- Publication type
Article
- DOI
10.3103/S0884591309010061