Omega_M and the CNOC Surveys

Details Omega_M and the CNOC Surveys Omega_M and the CNOC Surveys

1997-11-22

arxiv.org/abs/astro-ph/9711272v1

Astronomy and Astrophysics

Astrophysics

To appear in the 12 th Postdam Cosmology Workshop, "Large Scale Structure: Tracks and Traces", ed. V. Mueller, World Scientifi

Scientific paper

The CNOC1 cluster survey measures Omega_M via Oort's method, Omega_M= M/L x j/rho_c, where M/L is the field mass-to-light ratio, j is the field luminosity density and rho_c is the closure density. A wide range of potential systematic effects are explicitly controlled by independently deriving the mean cluster mass profile (finding good agreement with theoretical predictions), the cluster light profile, the redshift evolution of both cluster and field galaxies, the differential evolution between the two, and the field and cluster efficiencies for the conversion of baryons into galaxies. We conclude that Omega_M=0.19+/-0.06 where the errors are objectively evaluated via resampling methods. The redshift evolution of the numbers of clusters per unit co-moving volume over the 0< z < 0.6 range is found to be very slow, as is required for consistency with a low density universe. The evolution of galaxy clustering in the field is compatible with a low density universe, and strongly disfavors models of galaxy evolution that associate low density halos with individual galaxies.

Affiliated with

Also associated with

No associations

Rating

Omega_M and the CNOC Surveys does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Omega_M and the CNOC Surveys, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Omega_M and the CNOC Surveys will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-654309