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SDSS Cluster Abundances

This study presents findings on cluster abundances derived from the Sloan Digital Sky Survey (SDSS) by a collaborative team, including notable astrophysicists like Steve Kent, Neta Bahcall, and others. Utilizing the MaxBCG cluster finder and analyzing various redshift data (z = 0.06 to z = 0.20), we investigate the scaling relations and dynamics of galaxy clusters, including weak lensing and velocity dispersion. Our results provide significant constraints on cosmological parameters and enhance the understanding of structure formation in the universe.

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SDSS Cluster Abundances

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  1. SDSS Cluster Abundances Cluster Collaborators Steve Kent Rita Kim Tim Mcay Erin Sheldon Bob Nichol Chris Miller Tomo Goto Neta Bahcall Daniel Eisenstein Marc Postman Cosmology Collaborators: Martin Makler Steve Kent Scott Dodelson Josh Friemann Tim Mckay Erin Sheldon Constraints on Cosmology James Annis Experimental Astrophysics/ Fermilab

  2. The MaxBCG Cluster Finder The Signal

  3. z = 0.13 z = 0.06 z = 0.20 Likelihood= 1.9 Likelihood= -7.8 Likelihood= -8.4 N=0 N=19 N=0

  4. Cluster Photometric Redshifts Photo-z rms = 0.019 Spectroscopic z

  5. The Cluster Galaxy Number Function

  6. Scaling Mass with N Velocity Dispersion Weak Lensing σ (km/s) N log σ = 0.53 log N + 2.06 log σ = 0.70 log N + 1.75 log M ~ 1.5 log N log M ~ 2.1 log N

  7. Hubble Volume Simulations

  8. σ8 Ωm

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