Cosmological Constraints from SDSS maxBCG Cluster Abundances

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dc.creatorRozo, Eduardo
dc.creatorWechsler, Risa H.
dc.creatorKoester, Benjamin P.
dc.creatorMcKay, Timothy A.
dc.creatorEvrard, August E.
dc.creatorJohnston, David
dc.creatorSheldon, Erin S.
dc.creatorAnnis, James
dc.creatorFrieman, Joshua A.
dc.date2007-03-21
dc.date.accessioned2026-07-07T07:53:08Z
dc.date.available2026-07-07T07:53:08Z
dc.descriptionWe perform a maximum likelihood analysis of the cluster abundance measured in the SDSS using the maxBCG cluster finding algorithm. Our analysis is aimed at constraining the power spectrum normalization $σ_8$, and assumes flat cosmologies with a scale invariant spectrum, massless neutrinos, and CMB and supernova priors Omega_m*h^2=0.128+/-0.01 and h=0.72+/-0.05 respectively. Following the method described in the companion paper Rozo et al. 2007, we derive σ_8=0.92+/-0.10$ (1-sigma) after marginalizing over all major systematic uncertainties. We place strong lower limits on the normalization, sigma_8>0.76 (95% CL) (>0.68 at 99% CL). We also find that our analysis favors relatively low values for the slope of the Halo Occupation Distribution (HOD), alpha=0.83+/-0.06. The uncertainties of these determinations will substantially improve upon completion of an ongoing campaign to estimate dynamical, weak lensing, and X-ray cluster masses in the SDSS maxBCG cluster sample.
dc.description10 pages, 6 figures, ApJ Submitted
dc.identifierhttps://arxiv.org/abs/astro-ph/0703571
dc.identifierhttp://arxiv.org/abs/astro-ph/0703571
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/126137
dc.subjectAstrophysics
dc.titleCosmological Constraints from SDSS maxBCG Cluster Abundances
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