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27 April 2024 |
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Cosmological Constraints from SDSS maxBCG Cluster Abundances | | Eduardo Rozo
; Risa H. Wechsler
; Benjamin P. Koester
; Timothy A. McKay
; August E. Evrard
; David Johnston
; Erin S. Sheldon
; James Annis
; Joshua A. Frieman
; | | Date: |
21 Mar 2007 | | Abstract: | We 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 $sigma_8$, 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 sigma_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. | | Source: | arXiv, astro-ph/0703571 | | Services: | Forum | Review | PDF | Favorites | |
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