The Omega_M-Omega_Lambda Constraint from CNOC Clusters

Details The Omega_M-Omega_Lambda Constraint from CNOC Clusters The Omega_M-Omega_Lambda Constraint from CNOC Clusters

1998-04-28

arxiv.org/abs/astro-ph/9804312v1

Astronomy and Astrophysics

Astrophysics

4 pages LaTeX. To appear in "Fundamental Parameters in Cosmology," the proceedings of the XXXIIIrd Rencontres de Moriond

Scientific paper

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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