Galaxy collisions and their influence on the dynamics and evolution of groups and clusters of galaxies

Details Galaxy collisions and their influence on the dynamics and evolution of groups and clusters of galaxies Galaxy collisions and their influence on the dynamics and evolution of groups and clusters of galaxies

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....76...75r&link_type=abstract

Astronomy and Astrophysics, vol. 76, no. 1, June 1979, p. 75-85.

Astronomy and Astrophysics

Astrophysics

93

Astrophysics, Collisions, Disk Galaxies, Elliptical Galaxies, Galactic Clusters, Galactic Evolution, Interacting Galaxies, Astronomical Maps, Kinetic Energy, Many Body Problem, Mass Distribution, Mass Transfer, Orbital Elements, Spatial Distribution, Three Dimensional Motion

Scientific paper

The effect of collisions on the dynamics and evolution of groups and clusters of galaxies is investigated. It is assumed that galaxies are formed initially with massive spherical halos, and their subsequent evolution is studied by using N-body simulations. Firstly, individual galaxy-galaxy collisions are simulated for a large number of impact parameters, velocities, and masses, with approximately 30 point masses in each colliding galaxy. Loss of orbital kinetic energy, merging criteria, increase of internal energy, and mass loss from the galaxies are discussed. Secondly, the results of these calculations are used in calculating the energy change and mass loss of the galaxies in a cluster of 10-60 members. It is shown that, in particular during the collapse of a group or cluster of galaxies, a considerable fraction of the galaxies merge and that elliptical galaxies are good candidates for these merged systems. Observational consequences are discussed for a number of properties of groups of galaxies such as the occurrence of interacting galaxies, the relative number and spatial distribution of elliptical and disk galaxies, the formation of cD-galaxies, and the mass-to-light ratio of groups.

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