Binary galaxies with dark halos. I - Dynamics

Details Binary galaxies with dark halos. I - Dynamics Binary galaxies with dark halos. I - Dynamics

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...238...50s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 238, no. 1-2, Nov. 1990, p. 50-58. Research supported by CAPES.

Statistics

Computation

14

Computational Astrophysics, Dark Matter, Galactic Structure, Interacting Galaxies, Field Theory (Physics), Galactic Mass, Mass To Light Ratios, Monte Carlo Method

Scientific paper

A simple model for binary galaxies which incorporates an extended dark mass component is developed. A simple analytical description of the model that enables it to be used in a Monte Carlo algorithm for the distribution of orbital parameters of binaries is used to calculate the gravitational potential of a binary system consisting of two such galaxies. The effect of overlapping mass distributions in the potential calculations is considered, and orbits of binary galaxies are calculated. The combined effect of overlapping mass distributions and merging on binary dynamics is a depletion of high-velocity differences at small projected separations. It is concluded that there may be a considerable difference in derived orbit and intrinsic galaxy properties between the usual point-mass approximation and the more realistic model presented here.

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