Near-Infrared Properties of Moderate-Redshift Galaxy Clusters: Halo Occupation Number, Mass-to-Light Ratios and Omega_m

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dc.creatorMuzzin, Adam
dc.creatorYee, H. K. C.
dc.creatorHall, Patrick B.
dc.creatorLin, H.
dc.date2007-03-14
dc.date.accessioned2026-07-07T13:13:10Z
dc.date.available2026-07-07T13:13:10Z
dc.descriptionUsing 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 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 similar accuracy as T_{x}, L_{x} or optical richness (B_{gc}). Examination of the mass-to-light ratios of the clusters shows that similar 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 pm 0.02, which agrees well with recent combined concordance cosmology parameters, but, similar to previous cluster studies, is on the low-density end of preferred values.
dc.description18 pages, 6 figures, 2 tables, accepted by ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0703369
dc.identifierhttp://arxiv.org/abs/astro-ph/0703369
dc.identifierAstrophys.J.663:150-163,2007
dc.identifierdoi:10.1086/518229
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/229799
dc.subjectAstrophysics
dc.titleNear-Infrared Properties of Moderate-Redshift Galaxy Clusters: Halo Occupation Number, Mass-to-Light Ratios and Omega_m
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