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Triple Galaxies and a Hidden Mass Problem

Published online by Cambridge University Press:  12 April 2016

I.D. Karachentsev ,
V.E. Karachentseva  and
V.S. Lebedev
I.D. Karachentsev
Affiliation:
Special Astrophysical Observatory, USSR Academy of Sciences st. Zelenchukskaya, Stavropol Territory, 357147, USSR
V.E. Karachentseva
Affiliation:
Special Astrophysical Observatory, USSR Academy of Sciences st. Zelenchukskaya, Stavropol Territory, 357147, USSR
V.S. Lebedev
Affiliation:
Special Astrophysical Observatory, USSR Academy of Sciences st. Zelenchukskaya, Stavropol Territory, 357147, USSR

Abstract

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We 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 = —20.38, crossing time τ = 0.04 H−1. For different ways of estimation the median mass-to-luminosity ratio is (20 – 30)f⊙.

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.

Type
II. Classical Observations of Multiplets
Information
International Astronomical Union Colloquium , Volume 124: Paired and Interacting Galaxies , 1990 , pp. 115 - 127
Copyright
Copyright © NASA 1990

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