Abstract
Results are reported from simulations of the alterations in tidal stripping and tidal accretion caused by the presence of smoothly distributed missing mass (background) in Virgo-like clusters of galaxies. The simulations considered the collisional interactions of two galaxies treated as Schuster's spheres, one containing 170 test particles. The spheres were surrounded with either a mass equal to the total galactic mass or to nine times the galactic mass, or with no background exerting gravitational force. The presence of the background significantly decreased mass exchanges and losses. The implications the results have for simulations of collisions between galaxies are discussed. 30 references.
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