Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197..179g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 197, Oct. 1981, p. 179-208.
Astronomy and Astrophysics
Astronomy
84
Astronomical Models, Disk Galaxies, Galactic Evolution, Galactic Structure, Interacting Galaxies, Many Body Problem, Angular Momentum, Density Distribution, Elliptical Galaxies, Halos, Particle Interactions, Secular Variations, Stellar Mass Ejection
Scientific paper
Collisions of galaxies are investigated numerially using an N-body code (250 particles per galaxy) with emphasis on system evolution and possible relaxation effects. Collisions between three-component galaxies are found to be strongly spin-dependent for comparable halo and disk masses and sizes. This is attributed to particle resonances with the orbit and possibly direction-dependent effective half-mass radii. Merging cross sections are spin-dependent in parabolic encounters. The remnants have distinct visible cores and Hubble-type density profiles; they are triaxial, rotate slowly, and have anisotropic velocity structures; some of them fit the observational data for elliptical galaxies reasonably well.
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