Computer simulations of interacting galaxies in compact groups and the observed properties of triple galaxies

Details Computer simulations of interacting galaxies in compact groups and the observed properties of triple galaxies Computer simulations of interacting galaxies in compact groups and the observed properties of triple galaxies

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.2047z&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 6, p. 2047-2053.

Astronomy and Astrophysics

Astronomy

25

Astronomical Models, Computerized Simulation, Galactic Clusters, Interacting Galaxies, Dark Matter, Galactic Evolution

Scientific paper

Triplets of galaxies offer a good opportunity to measure the amount of dark matter in systems of galaxies. We use the extensive data set on triplets by Karachentsev et al. (1989) and try to model it by using computer simulations of interacting galaxies. Our simulated interactions include dynamical friction and mergers in addition to the usual softened Newtonian potential. In all, nearly 10,000 five-galaxy systems were calculated, and each was viewed from 20 random angles in order to derive statistical properties of the simulated triplets. It is possible to determine the mean mass of the triplets within an accuracy of about 40 percent. The best estimate for the mean mass-to-light ratio in Karachentsev triplets is 50 +/- 20 in solar units. The geometry of the projected configurations of the simulated triplets and the Karachentsev et al. triplets agree very well, in contrast to earlier three-body modeling. Overall, the observed properties of Karachentsev triplets agree well with the assumption that these triplets represent temporary phases in the evolution of small groups of galaxies.

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