Cluster Mass Profiles and Mass-to-light Ratios from Weak Lensing in the SDSS

Details Cluster Mass Profiles and Mass-to-light Ratios from Weak Lensing in the SDSS Cluster Mass Profiles and Mass-to-light Ratios from Weak Lensing in the SDSS

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20922204s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #222.04; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

The Maxbcg catalog of galaxy clusters, created from 7500 square degrees of Sloan Digital Sky Survey (SDSS) imaging data, is the largest yet assembled. These objects, ranging from small groups to massive clusters, provide an excellent laboratory to study the formation of structures in our universe. I will present measurements of the mean radial mass profile measured from weak gravitational lensing as a function of cluster richness and luminosity. The wide area of the SDSS allows measurements ranging from the inner halo (25 kpc) well into the surrounding large scale structure (30 Mpc). As predicted by the cold dark matter model, these mass profiles have a distinctive non-power law shape. They are well described by a universal NFW profile in the inner halo and linear correlations on large scales. The virial mass scales strongly with cluster richness. We also measure the total light of the galaxies in and around the clusters. The light is distributed in the cluster differently than the mass, with the light being more centrally concentrated. We find that the mass to light ratio is scale dependent and asymptotically approaches the same global value on large scales, independent of cluster mass.

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