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The Omega_M-Omega_Lambda Constraint from CNOC Clusters

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arxiv astro-ph/9804312 v1 pith:5QESIX3F submitted 1998-04-28 astro-ph

R. G. Carlberg , H. K. C. Yee , E. Ellingson , S. L. Morris , H. Lin , M. Sawicki , D. Patton , G. Wirth
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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
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keywords omegalambdaclusterscnocgalaxym-omegaredshiftresulting
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The CNOC redshift survey of galaxy clusters measures Omega_M from Omega_e(z)= M/L x j/\rho_c 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 Omega_e(z) has a strong dependence on cosmology which allows us to place the results in the Omega_M-Omega_Lambda plane. The resulting Omega_M declines if Omega_Lambda>0 and we find that Omega_Lambda<1.5.

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