NOAO >   Observing Info >   Approved Programs >   2014B-0338

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Proposal Information for 2014B-0338


PI: Bradford Benson, University of Chicago, bbenson@kicp.uchicago.edu
Address: Department of Astronomy and Astrophysics, 5640 South Ellis Avenue, Chicago, IL 60637, USA

CoI: Douglas Applegate, University of Bonn
CoI: Tim Schrabback, University of Bonn
CoI: John Carlstrom, University of Chicago
CoI: Joerg Dietrich, Universitaets-Sternwarte Muenchen
CoI: Anja von der Linden, Stanford University
CoI: Steve Allen, Stanford University

Title: Slaying Systematics: Maximizing Cosmological Power from HST-Measured Weak Lensing Masses of High-Redshift Clusters

Abstract: We aim to calibrate the SZ mass-scaling relation at z > 0.7 with high-quality weak-lensing measurements. We have already been awarded 60 orbits of HST imaging, and we seek to acquire complimentary i-band photometry for 15 clusters in order to nearly eliminate the dominant systematic in the lensing measurement: contamination by cluster galaxies. By combining HST imaging with deep I-band imaging, we can eliminate 95% of contaminating galaxies, thus enabling us to measure the mass-scaling normalization to 8% accuracy at 0.7 < z < 1.2. With such a calibration, the SPT clusters sample should improve constraints on sigma_8 and w by factors of 3 and 2, respectively, over CMB-only constraints, plus greatly improve redshift evolution studies when combined with low-redshift cluster samples.


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



NOAO >   Observing Info >   Approved Programs >   2014B-0338

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