Statistics – Computation
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...331..699b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 331, Aug. 15, 1988, p. 699-717.
Statistics
Computation
435
Computational Astrophysics, Disk Galaxies, Elliptical Galaxies, Galactic Rotation, Galactic Structure, Angular Momentum, Brightness Distribution, Dark Matter, Galactic Evolution, Interacting Galaxies, Mass Distribution, Orbit Decay, Star Formation
Scientific paper
The first numerical models of interacting galaxies are presented in which all dynamical components of the participants are modeled as fully three-dimensional N-body systems with thousands of particles each and the equations of motion are integrated by a self-consistent algorithm without arbitrary restrictions on the geometry or spatial extent of the mass distribution. Several encounters between multicomponent galaxy models are described, starting with a lookalike for the 'Antennae', NGC 4038/9. The influence of massive halos is shown by contrasting models run with and without dark matter. The results show that encounters involving pairs of disk/halo galaxies can produce impressive tidal tails while permitting the visible galaxies to merge on a short time scale, mimicking 'double-tailed' objects. Extensive dark halos are very effective at soaking up binding energy and angular momentum from other components, significantly altering the distribution and dynamics of the luminous material.
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