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2007ApJ...663..150M - Astrophys. J., 663, 150-163 (2007/July-1)

Near-infrared properties of moderate-redshift galaxy clusters. II. Halo occupation number, Mass-to-Light ratios, and Ωm.


Abstract (from CDS):

Using K-band imaging for 15 of the Canadian Network for Observational Cosmology (CNOC1) clusters we examine the near-infrared properties of moderate-redshift (0.19<z<0.55) galaxy clusters. We find that the number of K-band selected cluster galaxies within R500(the halo occupation number, HON) is well correlated with the cluster dynamical mass (M500) and X-ray temperature (TX); however, the intrinsic scatter in these scaling relations is 37% and 46%, respectively. Comparison with clusters in the local universe shows that the HON-M500 relation does not evolve significantly between z=0 and z∼0.3. This suggests that if dark matter halos are disrupted or undergo significant tidal stripping in high-density regions as seen in numerical simulations, the stellar mass within the halos is tightly bound, and not removed during the process. The total K-band cluster light (L_200,K_) and K-band-selected richness (parameterized by B_gc,K_) are also correlated with both the cluster TX and M200. The total (intrinsic) scatter in the L_200,K_-M200 and B_gc,K_-M200relations are 43% (31%) and 35% (18%), respectively, and indicates that for massive clusters both L_200,K_ and B_gc,K_can predict M200with accuracy similar to that of TX, LX, or optical richness (Bgc). Examination of the mass-to-light ratios of the clusters shows that similarly to local clusters, the K-band mass-to-light ratio is an increasing function of halo mass. Using the K-band mass-to-light ratios of the clusters, we apply the Oort technique and find Ωm,0=0.22±0.02, which agrees well with recent combined concordance cosmology parameters, but, similarly to previous cluster studies, is on the low-density end of preferred values.

Abstract Copyright:

Journal keyword(s): Cosmology: Dark Matter - Galaxies: Clusters: General - Galaxies: Fundamental Parameters - Galaxies: Photometry - Cosmology: Large-Scale Structure of Universe

Simbad objects: 15

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