Cosmology with the Cluster Mass Function

Details Cosmology with the Cluster Mass Function Cosmology with the Cluster Mass Function

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.7732r&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #77.32; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

Galaxy clusters probe the amplitude of density fluctuations in the early universe and the growth of large-scale structure. I will discuss our recent efforts to constrain Ω_m and σ_8 using the mass function of X-ray selected galaxy clusters in the Sloan Digital Sky Survey. Our results agree well with Third-Year WMAP results and have statistical uncertainties competitive with cosmic shear estimates. Alternatively, these measurements can be used to estimate the velocity segregation of cluster galaxies. Taking the Third-Year WMAP results as a prior, we estimate that cluster galaxies have a velocity dispersion 1.3 times larger than the dark matter. I will discuss future efforts to improve these constraints and to use the evolution of the mass function to probe dark energy.

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