Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pazh...14..970k&link_type=abstract
Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 14, Nov. 1988, p. 970-978. In Russian. In Russian.
Astronomy and Astrophysics
Astronomy
1
Astronomical Models, Galactic Mass, Many Body Problem, Astronomical Catalogs, Gravitational Fields, Mass Distribution, Mass To Light Ratios, Radial Velocity, Virial Theorem
Scientific paper
The physical properties of small groups of galaxies are studied using numerical N-body simulations and taking the possible presence of distributed hidden mass into account. It is shown that the use of virial relations for the estimation of the mass of a galaxy triplet according to the radial velocities and projective distances of its components may cause uncertainties of two, three, or four orders of magnitude. A statistical method incorporating data on the total ensemble of triplet systems is used to estimate the mass of the 'physical' triplets from the catalogue of Karatchentseva et al. (1979). Using simulated ensembles imitating the main statistical parameters of the acutal ensemble of triplets, the characteristic triplet mass is found to be 3 x 10 to the 12th solar masses. This value is almost one order of magnitude greater than the value obtained from the standard mass/luminosity ratio.
Chernin Arthur D.
Kiseleva Ludmila G.
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