The Omegaₘ-Omegaₗambda Constraint from CNOC Clusters
Carlberg, R. G. · Yee, H. K. C. · Ellingson, E. · Morris, S. L. · Lin, H. · Sawicki, M. · Patton, D. · Wirth, G. · Abraham, R. · Gravel, P. · Pritchet, C. J. · Smecker-Hane, T. · Schade, D. · Hartwick, F. D. A. · Hesser, J. E. · Hutchings, J. B. · Oke, J. B.
Original · EN
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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