Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-04-07
Astronomy and Astrophysics
Astrophysics
to appear in Ringberg Workshop on Large-Scale Structure (ed. D. Hamilton) 14 pages, also available at http://manaslu.astro.u
Scientific paper
Rich galaxy clusters are powerful probes of both cosmological and galaxy evolution parameters. The CNOC cluster survey was primarily designed to distinguish between Omega=1 and Omega~0.2 cosmologies. Projected foreground and background galaxies provide a field sample of comparable size. The results strongly support a low-density universe. The luminous cluster galaxies are about 10-30% fainter, depending on color, than the comparable field galaxies, but otherwise they show a slow and nearly parallel evolution. On the average, there is no excess star formation when galaxies fall into clusters. These data provide the basis for a simple Lambda measurement using the survey's clusters and the field data. The errors in Omega_M, Lambda, sigma_8 and galaxy evolution parameters could be reduced to a few percent with a sample of a few hundred clusters spread over the 0
Abraham Robert
Balogh Michael
Carlberg Ray G.
Ellingson Erica E.
Gravel Pierre
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