Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....95..349r&link_type=abstract
Astronomy and Astrophysics, vol. 95, no. 2, Mar. 1981, p. 349-361.
Astronomy and Astrophysics
Astrophysics
45
Astronomical Models, Cosmology, Galactic Clusters, Galactic Evolution, Galactic Structure, Many Body Problem, Mass Spectra, Random Processes, Universe
Scientific paper
Expanding universe models containing 400 equal-mass galaxies are numerically simulated and the effects of galaxy collisions are taken into account. The merging rate is insensitive to galactic parameters since most mergers occur between galaxies in bound orbits. The final fraction of mixed galaxies is found to be about 10-40% in both the open and closed universe models. Both galaxy clustering and the evolution of the galaxy mass function seem consistent with a simple infall model. The mass function evolution is studied by Monte Carlo simulations on a randomly distributed system of galaxies where the merging probability of a pair of galaxies is chosen to be proportional to their combined mass. Such a merging probability, consistent with the results of the expanding universe simulations, gives a mass spectrum that approaches a self-similar form identical to the Press and Schechter mass function in the case of random initial fluctuations.
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