Mathematics – Logic
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980rspta.296..351a&link_type=abstract
(Royal Society, Discussion on the Origin and Early Evolution of the Galaxies, London, England, Feb. 14, 15, 1979.) Royal Society
Mathematics
Logic
1
Astronomical Models, Big Bang Cosmology, Galactic Evolution, Many Body Problem, Angular Momentum, Coalescing, Elliptical Galaxies, Orbit Perturbation
Scientific paper
Numerical N-body simulations of galaxy mergers have been performed for models that include the cosmological expansion. Even conservative cross sections give rise to a substantial proportion of merged objects that are tentatively associated with elliptical galaxies. The merging process is not confined to the early expansion phase when the velocity dispersion is small but also occurs inside groups that form by the growth of initial density fluctuations. A wide range of masses is obtained from an initial pseudo-random distribution of unit masses; this could account for the massive cD galaxies. The mergers occur predominantly from bound pairs in highly eccentric orbits and the resulting angular momentum is consistent with the small rotational velocities observed for elliptical galaxies.
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