Computer Science
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980rspta.296..347w&link_type=abstract
(Royal Society, Discussion on the Origin and Early Evolution of the Galaxies, London, England, Feb. 14, 15, 1979.) Royal Society
Computer Science
1
Coalescing, Galactic Evolution, Gravitational Effects, Interacting Galaxies, Tides, Collision Parameters, Galactic Structure, Orbit Calculation
Scientific paper
Interpenetrating encounters between galaxies may occur frequently in groups and clusters of galaxies, and will be particularly common if most galaxies possess extended massive halos. When the encounter velocity of two galaxies is comparable with the velocity dispersion of the stars they contain, collisions are highly inelastic and may lead to a merger between the two objects. Such mergers can be investigated by direct numerical simulation. The coalescence of two similar 'galaxies' from a bound or parabolic initial orbit usually produces a centrally condensed oblate spheroidal system whose structure depends only weakly on that of the initial objects. Such mergers give rise to galaxies rotating as slowly as observed systems only if the initial impact parameter of the orbit is much smaller than is necessary to produce a strong interaction.
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