Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sva....36..231a&link_type=abstract
Soviet Astronomy, Vol.36, NO. 3/MAY, P.231, 1992
Astronomy and Astrophysics
Astronomy
5
Scientific paper
The unreliability of individual estimates of the virial mass of a triplet of galaxies is confirmed: the spread in estimates due to projection effects and the non-steadiness of triplets reaches 1.5 orders of magnitude. A catalog modeling method is suggested for statistically estimating the mass M_0_ of dark matter in a triplet. The method is tested on a sample of 46 probable physical triplets of galaxies from the list of I. D. Karachentsev et al. A density profile ρ_d_(R)~R^-2^ of dark matter is considered. The most likely value of M_0_ depends on the total mass M_d_ of dark matter and the radius R_d_ of the sphere within which the dark matter is distributed. The number of model catalogs in agreement with observations is largest for M_d_/R_d_~10m/d where m is the average mass of a galaxy and d is the average size of a triplet. This estimate of M_d_/R_d_ probably corresponds to some optimal density of dark matter in a triplet. We then have the average estimate M_0_ = (13.7+/-3.2)m or (4.6+/-1.1)_t_, where M_t_ is the total mass of the triplet.
Anosova Zh. P.
Chernin Arthur D.
Kiseleva Ludmila G.
Orlov Valeri
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