AAS 197, January 2001
Session 105. Gravitational Lensing
Display, Thursday, January 11, 2001, 9:30-4:00pm, Exhibit Hall

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[105.02] Weak Lensing from SDSS/RASS Galaxy Clusters

E. Sheldon, T. McKay, J. Racusin (Mich.), J. Annis, A. Stebbins (Fermi Lab), C. Miller, R Nichol (CMU), H. Böhringer, W. Voges (MPE), P. Fischer (Toronto), J. Frieman, M. Joffre, D. Johnston (Chicago), SDSS Collaboration

We present a weak lensing study of SDSS/RASS clusters. Candidates are selected from SDSS commissioning data and matched to sources found independently in the Rosat All Sky Survey. The correlation with RASS improves the purity of the cluster sample. We use good photometric redshifts for each cluster to rescale and combine their lensing measurements and calculate an X--ray luminosity for each cluster. We detect significant shear to 2h-1Mpc. We investigate the relationship between lensing masses, which probe the total gravitational mass of the system, and X--ray luminosity. These initial results, taken from just 2% of the final SDSS survey area, demonstrate the power of cluster lensing in the SDSS.

The SDSS is a joint project of the University of Chicago, Fermilab, the Institute for Advanced Study, the Japan Participation Group, Johns Hopkins University, Max-Planck-Institute for Astronomy, Princeton University, United States Naval Observatory and the University of Washington. Funding has been provided by the Alfred P. Sloan Foundation, the member institutions, NASA, NSF, the U.S. DoE, and the Ministry of Education of Japan.

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