Cosmology with Clusters of Galaxies

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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.

Original languageEnglish (US)
Pages (from-to)32-36
Number of pages5
JournalPhysica Scripta T
StatePublished - 2000

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics
  • Condensed Matter Physics
  • General Physics and Astronomy


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