Computer Simulations of Interacting Galaxies in Compact Groups and the Observed Properties of Close Binary Galaxies

Astronomy and Astrophysics – Astronomy

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Galaxies: Binary, Galaxies: Interactions, Galaxies: Clustering

Scientific paper

galaxies by Karachentsev. It is assumed that initially the galaxies were members of small groups which degenerated to binary systems via mergers. The samples obtained in this way are compared with the observed sample. We find that it is possible to get a good match between the observed and the theoretical distributions of the projected separations and radial velocities of the binaries. This allows us to overlay the theoretical mass distribution with the observed luminosity distribution of the galaxies in question and to determine the average mass-to-light ratio for the systems. As this method is insensitive to small numbers of optical pairs or otherwise unbound galaxies, the resulting mass-to-light ratio of 50 solar units should be a robust estimate. Further support for the merger scenario is provided by the larger than average luminosity in close binary pairs, as well as their relatively short time scales for a merger to a single galaxy. The pairs also typically contain signs of interaction which further confirm the model assumption that the close binary pairs are transitionary systems.

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