Mass-to-light ratios for galaxy pairs and triplets in various environments

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 M vir / L are 12 M ⊙ / L ⊙ for isolated pairs, 44 M ⊙ / L ⊙ for isolated triplets, and 7 (8) M ⊙ / L ⊙ for compa...

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Bibliographic Details
Published in:Kinematics and physics of celestial bodies 2009-02, Vol.25 (1), p.43-47
Main Authors: Melnik, O. V., Elyiv, A. A., Vavilova, I. B.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics
Dark matter
Extragalactic Astronomy and Cosmology
Observations and Techniques
Physics
Physics and Astronomy
Stars & galaxies
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Summary: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 M vir / 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.
ISSN:0884-5913
1934-8401
DOI:10.3103/S0884591309010061