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Dark Matter

Published online by Cambridge University Press:  19 July 2016

R. Sancisi  and
T.S. van Albada
R. Sancisi
Affiliation:
Kapteyn Astronomical Institute, Groningen University, Postbus 800, 9700 AV Groningen
T.S. van Albada
Affiliation:
Kapteyn Astronomical Institute, Groningen University, Postbus 800, 9700 AV Groningen

Abstract

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The observational evidence for unseen matter is briefly reviewed for objects ranging from small to very large scales. The existence of large mass discrepancies is clearly recognized in individual spiral galaxies and in rich clusters of galaxies. For other systems - dwarfs, ellipticals, binaries and groups - the results are more uncertain and still rather controversial. The data on spirals indicate values of the cosmological density parameter Ω around 0.02, those on clusters Ω ≃ 0.2. The spatial distribution of this dark matter is still largely unknown: while on the galaxy scale it must be located mainly in the outer parts of the stellar system, in clusters it is unclear whether it follows the distribution of the visible galaxies or not.

Type
Chapter XII: Dark Matter
Information
Symposium - International Astronomical Union , Volume 124: Observational Cosmology , 1987 , pp. 699 - 712
Copyright
Copyright © Reidel 1987 

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