N-body studies of compact groups of galaxies dominated by dark matter

Details N-body studies of compact groups of galaxies dominated by dark matter N-body studies of compact groups of galaxies dominated by dark matter

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.208..873b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 208, June 15, 1984, p. 873-885.

Mathematics

Logic

36

Cosmology, Dark Matter, Galactic Clusters, Galactic Evolution, Many Body Problem, Mass To Light Ratios, Astronomical Models, Celestial Mechanics, Mass Distribution, Virial Theorem

Scientific paper

Systems consisting of a few galaxies embedded in a background cluster of smoothly distributed dark matter may evolve significantly over cosmological time-scales as the galaxies spiral to the centre. Virial and other mass estimates using the present galactic positions and velocities yield serious underestimates of the total system mass. N-body models of such systems confirm the qualitative predictions of simplified dynamical theories. However, the evolution in real systems is retarded by the response of the background to the galaxies; thus theories which assume a fixed background generally overestimate evolutionary effects.

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