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Dark Matter in Groups and Clusters of Galaxies

Published online by Cambridge University Press:  12 April 2016

Jaan Einasto  and
Maret Einasto
Jaan Einasto
Affiliation:
Tartu Observatory, Estonia
Maret Einasto
Affiliation:
Tartu Observatory, Estonia

Abstract

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We compare the characteristics of stellar populations with those of dark halos. 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 ΩM = 0.3 ± 0.1, about 80 % of this matter is nonbaryonic 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. All bright galaxies are surrounded by dark matter halos of external radii 200 − 300 kpc; halos consist mostly of non-baryonic matter with some mixture of hot gas. The Universe is dominated by dark energy (cosmological constant) term. Dark matter dominates in the dynamical evolution of galaxies in groups and clusters.

Type
Part 5. Dark Matter and Clustering
Information
International Astronomical Union Colloquium , Volume 174: Small Galaxy Groups , 2000 , pp. 360 - 372
Copyright
Copyright © Astronomical Society of the Pacific 2000

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