Triple galaxies and a hidden mass problem

Details Triple galaxies and a hidden mass problem Triple galaxies and a hidden mass problem

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3098..115k&link_type=abstract

In NASA, Marshall Space Flight Center, Paired and Interacting Galaxies: International Astronomical Union Colloquium No. 124 p 11

Statistics

4

Brightness, Galactic Clusters, Galaxies, Stellar Magnitude, Binary Data, Criteria, Crossings, Isolation, Mass, Median (Statistics), Morphology, Northern Sky, Radial Velocity, Radii, Velocity Distribution

Scientific paper

The authors consider a homogeneous sample of 84 triple systems of galaxies with components brighter than m = 15.7, located in the northern sky and satisfying an isolation criterion with respect to neighboring galaxies in projection. The distributions of basic dynamical parameters for triplets have median values as follows: radial velocity dispersion 133 km/s, mean harmonic radius 63 kpc, absolute magnitude of galaxies MB equals -20.38, crossing time tau = 0.04 Hminus 1. For different ways of estimation the median mass-to-luminosity ratio is (20 - 30). A comparison of the last value with the ones for single and binary galaxies shows the presence of a virial mass excess for triplets by a factor 4. The mass-to-luminosity ratio is practically uncorrelated with linear size of triplets or with morphological types of their components. We note that a significant part of the virial excess may be explained by the presence of nonisolated triple configurations in the sample, which are produced by debris of more populous groups of galaxies.

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