NOAO >   Observing Info >   Approved Programs >   2011A-0268

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Proposal Information for 2011A-0268


PI: Rachel Mandelbaum, Princeton University, rmandelb@astro.princeton.edu
Address: Department of Astrophysical Sciences, 4 Ivy Lane, Peyton Hall, Princeton, NJ 08544, USA

CoI: Reiko Nakajima, University of California (Berkeley)
CoI: Gary Bernstein, University of Pennsylvania
CoI: Christopher J. MacDonald, University of Pennsylvania
CoI: Sanghamitra Deb, Lawrence Berkeley National Lab
CoI: Megan Donahue, Michigan State University
CoI: John P. Hughes, Rutgers University
CoI: Neta Bahcall, Princeton University
CoI: Tim Schrabback, Universiteit Leiden
CoI: Satoshi Miyazaki, National Astronomical Obs of Japan (NAOJ), Subaru Telescope
CoI: Andrey V. Kravtsov, University of Chicago
CoI: Kenneth Cavagnolo, Observatoire de la Côte d'Azur
CoI: Charles R. Keeton, Rutgers University

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- temperature relation for massive clusters, which is essential for using clusters to constrain cosmological parameters, and (b) use the relations between WL mass, X-ray temperature, and other structural variables to test numerical models of cluster evolution. There has to date been no cluster lensing survey with sufficiently large sample size and sufficiently low 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.


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