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Date and Time of the Query: 2019-08-18 T13:24:53 PDT
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For refcode 2007ApJ...663..150M:
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Copyright by American Astronomical Society. Reproduced by permission
2007ApJ...663..150M Near-Infrared Properties of Moderate-Redshift Galaxy Clusters. II. Halo Occupation Number, Mass-to-Light Ratios, and {OMEGA}_m_ Adam Muzzin, H. K. C. Yee, Patrick B. Hall, and H. Lin Abstract. 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 R_500_ (the halo occupation number, HON) is well correlated with the cluster dynamical mass (M_500_) and X-ray temperature (T_X_); however, the intrinsic scatter in these scaling relations is 37% and 46%, respectively. Comparison with clusters in the local universe shows that the HON-M_500_ 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 T_X_ and M_200_. The total (intrinsic) scatter in the L_200,K_-M_200_ and B_gc,K_-M_200_ relations are 43% (31%) and 35% (18%), respectively, and indicates that for massive clusters both L_200,K_ and B_gc,K_ can predict M_200_ with accuracy similar to that of T_X_, L_X_, or optical richness (B_gc_). 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 {OMEGA}_m,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. Key words: Cosmology: Dark Matter, Galaxies: Clusters: General, Galaxies: Fundamental Parameters, Galaxies: Photometry, Cosmology: Large-Scale Structure of Universe
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