Triple galaxies and the hidden mass problem.
Abstract
The authors consider a homogeneous sample of 84 triple systems of galaxies with components brighter than 15m7, located at the northern sky and satisfying the isolateness criterion in respect to neighbouring galaxies in projection. Triplets' distribution according to basic dynamic parameters have such median values: a radial velocity dispersion - 133 km/s, mean - harmonic radius - 63 kpc, an absolute magnitude of galaxies - -20m38, a crossing time - 0.04 H-1. Under different ways of estimations the median of mass-to-luminosity ratio consists (20 - 30)fsun. A comparison of the last value with the ones for single and binary galaxies shows the presence of a virial mass excess for triples ≡4 times. The mass-to-luminosity ratio correlates neither with the linear size of a triplet nor with the morphological type of its components. The authors note, that an essential 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 populated groups of galaxies.
- Publication:
-
Astrofizicheskie Issledovaniia Izvestiya Spetsial'noj Astrofizicheskoj Observatorii
- Pub Date:
- 1989
- Bibcode:
- 1989AISAO..27...67K
- Keywords:
-
- Missing Mass: Multiple Galaxies