Dark Matter in Groups and Clusters of Galaxies

Details Dark Matter in Groups and Clusters of Galaxies Dark Matter in Groups and Clusters of Galaxies

1999-09-26

arxiv.org/abs/astro-ph/9909437v1

Publ.Astron.Soc.Pac. 209 (2000) 360-372

Astronomy and Astrophysics

Astrophysics

13 pages LaTeX text (sty files added), 2 PostScript Figures, submitted to Proceedings of the IAU Coll. 174 "Small Galaxy Group

Scientific paper

A short story of dark matter as an example of a scientific revolution is given. The characteristics of stellar populations are compared with those of dark halos. The mean mass-to-luminosity ratio of stellar populations is found to be 4 in Solar units. Dark matter around galaxies, and in groups, clusters and voids is discussed. Modern data suggest that the overall density of matter in the Universe is 0.3 +- 0.1, about 80% of this matter is non-baryonic dark matter, and about 20% is baryonic, mostly in the form of hot intra-cluster and intragroup gas, the rest in stellar populations of galaxies. The Universe is dominated by dark energy (cosmological constant) term.

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