Large-scale clustering of galaxies with massive dark halos. II - Mass-to-light profiles and dynamical mass estimates of galaxy groups

Details Large-scale clustering of galaxies with massive dark halos. II - Mass-to-light profiles and dynamical mass estimates of galaxy groups Large-scale clustering of galaxies with massive dark halos. II - Mass-to-light profiles and dynamical mass estimates of galaxy groups

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...316...36e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 316, May 1, 1987, p. 36-48.

Astronomy and Astrophysics

Astrophysics

20

Astronomical Models, Dark Matter, Galactic Clusters, Halos, Mass To Light Ratios, Virial Theorem, Many Body Problem, Two Body Problem

Scientific paper

Properties of groups of galaxies evolved within large-scale clustering simulations are examined. Models begun with 800 galaxies imbedded in extended dark-matter halos were run in flat and open cosmologies. Each galaxy is represented by a single "luminous" particle and its halo comprised of 25 "dark" particles. Ninety percent of the mass is in the dark component. For comparison, similar runs with no dark matter were performed for each cosmology. A group-finding algorithm identifies well-relaxed groups in virial equilibrium. Mean mass and "light" profiles exhibit evidence for segregation of galaxies from dark matter. In the dark-halo models, median virial masses derived from galaxy information alone systematically underestimate total group masses by large factors. The models show that dynamical segregation of galaxies from dark matter is capable of "biasing" the galaxy distribution such that it ends up tracing ≡35% of the total mass in the universe.

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