Cosmology with Clusters of Galaxies

Details Cosmology with Clusters of Galaxies Cosmology with Clusters of Galaxies

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ppu..conf...32b&link_type=abstract

PARTICLE PHYSICS AND THE UNIVERSE. Proceedings of Nobel Symposium 109. Held 20-25 August 1998 in Haga Slott, Enköping, Sweden. E

Physics

Galaxy Clusters, Observational Cosmology, Dark Matter

Scientific paper

Rich clusters of galaxies, the largest virialized systems known, place some of the most powerful constraints on cosmology. I discuss below the use of clusters of galaxies in addressing two fundamental questions: What is the mass-density of the universe? and how is the mass distributed? I show that several independent methods utilizing clusters of galaxies--cluster dynamics and mass-to-light ratio, baryon fractions in clusters, and cluster evolution--all indicate the same robust result: the mass-density of the universe is low, Ωm ≃ 0.2, and the mass approximately traces light on large scales.

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