The OmegaM-OmegaLambda Constraint from CNOC Clusters
R. G. Carlberg, H. K. C. Yee, E. Ellingson, S. L. Morris, H. Lin, M. Sawicki, D. Patton, G. Wirth, R. Abraham, P. Gravel, C. J. Pritchet, T. Smecker-Hane, D. Schade, F. D. A. Hartwick, J. E. Hesser, J. B. Hutchings, J. B. Oke
Abstract
The CNOC redshift survey of galaxy clusters measures OmegaM from Omegae(z)= M/L x j/ρc which can be applied on a cluster-by-cluster basis. The mass-to-light ratios, M/L, are estimated from rich galaxy clusters, corrected to the field population over the 0.18 to 0.55 redshift range. Since the luminosity density depends on cosmological volumes, the resulting Omegae(z) has a strong dependence on cosmology which allows us to place the results in the OmegaM-OmegaLambda plane. The resulting OmegaM declines if OmegaLambda>0 and we find that OmegaLambda<1.5.
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