Cosmological Constraints From SDSS MaxBCG Cluster Abundances

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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}{sub 8}, and assumes flat cosmologies with a scale invariant spectrum, massless neutrinos, and CMB and supernova priors {Omega}{sub m}h{sup 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}{sub 8} = 0.92 {+-} 0.10 (1{sigma}) after marginalizing over all major systematic uncertainties. We place strong lower limits on the normalization, {sigma}{sub 8} ... continued below

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10 pages

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Rozo, Eduardo; Wechsler, Risa H.; Koester, Benjamin P.; McKay, Timothy A.; Evrard, August E.; Johnston, David et al. March 26, 2007.

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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}{sub 8}, and assumes flat cosmologies with a scale invariant spectrum, massless neutrinos, and CMB and supernova priors {Omega}{sub m}h{sup 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}{sub 8} = 0.92 {+-} 0.10 (1{sigma}) after marginalizing over all major systematic uncertainties. We place strong lower limits on the normalization, {sigma}{sub 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.

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10 pages

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  • Journal Name: Submitted to Astrophys.J.

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  • Report No.: SLAC-PUB-12415
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 901581
  • Archival Resource Key: ark:/67531/metadc890039

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  • March 26, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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  • July 26, 2017, 10:31 a.m.

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Rozo, Eduardo; Wechsler, Risa H.; Koester, Benjamin P.; McKay, Timothy A.; Evrard, August E.; Johnston, David et al. Cosmological Constraints From SDSS MaxBCG Cluster Abundances, article, March 26, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc890039/: accessed April 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.