The close approaches and coalescence in triple systems of gravitating masses.

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Coalescing, Galactic Evolution, Gravitational Effects, Angular Momentum, Computerized Simulation, Dark Matter, Galactic Clusters

Scientific paper

By computer simulations, the dynamical evolution of plane triple systems of gaseous protogalaxies and galaxies with zero initial velocities has been studied. Inside the region D of initial configurations, some subregions have been revealed corresponding to a coalescence of protogalaxies on the first double approach. The average spin moments of 'mergers' are approximately equal to those typical of disk galaxies. In triple galaxies, a coalescence on the first double approach does not occur. The presence of significant hidden mass makes the approaches wider and prevents the coalescence of bodies in the systems without a central object. A central pair in a group of galaxies aids to coalescence. Also, the change during time of the virial coefficient has been investigated.

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