NOAO >   Observing Info >   Approved Programs >   2012A-0272

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Proposal Information for 2012A-0272


PI: Rachel Mandelbaum, Carnegie Mellon University, rmandelb@andrew.cmu.edu
Address: Department of Physics, 5000 Forbes Ave., Pittsburgh, PA 15213, USA

CoI: Reiko Nakajima, Universitaet Bonn
CoI: Gary Bernstein, University of Pennsylvania
CoI: Christopher J. MacDonald, University of Pennsylvania
CoI: Sanghamitra Deb, Argonne National Laboratory
CoI: Megan Donahue, Michigan State University
CoI: John P. Hughes, Rutgers University
CoI: Neta Bahcall, Princeton University
CoI: Tim Schrabback, Stanford University
CoI: Satoshi Miyazaki, National Astronomical Obs of Japan (NAOJ), Subaru Telescope
CoI: Andrey V. Kravtsov, University of Chicago

Title: Normalization and scatter of the mass-temperature relation for supermassive galaxy clusters

Abstract: We propose to complete a high-accuracy survey of the 20 most massive clusters in the northern hemisphere at 0.15<z<0.3, to yield a uniform catalog of X-ray, galaxy, and dark-matter properties (from weak gravitational lensing, WL). All quantities will be determined with high S/N and low systematic errors. The major scientific goals are to (a) determine the normalization \em and scatter in the mass vs. X-ray temperature (T_X) relation for massive clusters, which is essential for using clusters to constrain cosmological parameters, and (b) use the relations between WL mass, T_X, and other structural variables to test numerical models of cluster evolution. To date, there has not been a cluster lensing survey with sufficiently large sample size and small random and systematic errors to infer the intrinsic component of the M- T_X scatter. We expect to determine the scatter in the M-T_X relation to +/- 5%. All targets have existing Chandra, XMM, and ASCA X-ray data, HST strong-lensing imaging, and good-seeing WL imaging from Subaru or MMT. With this proposal, we will complete multiband Mosaic observations for photometric redshifts. Uniform photo-z's are essential to properly calibrate the WL data and isolate the (unlensed) cluster member galaxies.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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