The dynamical state of groups of galaxies

Details The dynamical state of groups of galaxies The dynamical state of groups of galaxies

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.215..517b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 215, Aug. 1, 1985, p. 517-536.

Statistics

Computation

141

Celestial Mechanics, Galactic Evolution, Astronomical Models, Computational Astrophysics, Trajectories, Virial Theorem

Scientific paper

Groups of galaxies, which are probable sites for the merging and interaction of galaxies and may significantly evolve in a fraction of a Hubble time, are presently addressed in light of a series of N-body experiments modeling the evolution of groups of five to ten galaxies with massive dark haloes from a wide range of initial conditions. Because galaxy-galaxy and galaxy-background interactions extract orbital energy from the galaxies, which collect at the center of the system, the dynamical mass and time scales inferred on the basis of such galaxies significantly underestimate the true values for the system as a whole. The present results imply that many group members are merger remnants, that groups of galaxies evolve significantly on a dynamical time scale, and that the Omega value estimated on the basis of the virial M/L ratios of groups is too low by a factor of about 3 or more.

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