The Evolution of Massive Clusters: Determining Omega and Sigma8

Details The Evolution of Massive Clusters: Determining Omega and Sigma8 The Evolution of Massive Clusters: Determining Omega and Sigma8

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.9502b&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #95.02; Bulletin of the American Astronomical Society, Vol. 29, p.1363

Astronomy and Astrophysics

Astronomy

Scientific paper

We use the evolution of the abundance of massive clusters of galaxies to constrain the mass density parameter of the universe, omega, and the amplitude of mass fluctuations, sigma8. By comparing the observed abundance of high-mass clusters at z ~ 0.5 - 1 with the expected abundance in different cosmologies we break the classical degeneracy between omega and sigma8 and determine each of the parameters independently. The relatively weak observed evolution of the cluster abundance with redshift suggests a universe with low-density, omega ~ 0.3 +- 0.1, and high sigma8. Models with Omega = 1 (low sigma8) are excluded by the observed high density of massive distant clusters; such models predict a very low abundance of massive clusters at z>0.5. This method places one of the strongest constraints on cosmology and suggests a low-density, nearly unbiased universe.

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