Cosmology with clusters of galaxies

Details Cosmology with clusters of galaxies Cosmology with clusters of galaxies

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005nuphs.138...16b&link_type=abstract

Nuclear Physics B, Volume 138, p. 16-20.

Physics

Nuclear Physics

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 determining two fundamental properties of the universe: the mass-density of the universe, and the distribution of dark matter. I show that several independent methods utilizing clusters of galaxies cluster dynamics and the mass-to-light function, baryon fraction in clusters, and cluster abundance and its evolution all indicate the same result: a universe with a low mass-density, ˜20% of the critical density needed to halt the universal expansion, and a mass distribution that approximately traces light on large scales.

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