NOAO >   Observing Info >   Approved Programs >   2009B-0340

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Proposal Information for 2009B-0340


PI: Doug Clowe, Ohio University, clowe@ohio.edu
Address: Physics Department, Clippinger Lab 251B, Athens, OH 45701, US

CoI: David Johnston, Northwestern University
CoI: Melville P. Ulmer, Northwestern University
CoI: Christophe Adami, OAMP, Marseille
CoI: Tim Schrabback, Leiden Observatory, Universiteit Leiden
CoI: James Annis, Fermi National Accelerator Lab

Title: Photometric Redshifts for Weak Lensing Tomography of Galaxy Clusters

Abstract: Weak lensing tomography is a powerful new tool for constraining cosmology in a way that is independent of both the physics and systematics of other methods. By measuring the variation in the weak lensing shear as a function of background galaxy redshift, we make a purely geometric measurement of the expansion rate history. This has the ability to measure dark energy and even constrain deviations from general relativity. We apply this technique to 91 clusters for which we have Hubble Space Telescope data. This proposal, a continuation of a previous NOAO project, seeks to follow up these clusters and obtain ground-based photometry which will provide photometric redshifts, fully enabling the technique. In addition, we will provide a legacy data set of galaxy clusters with Hubble images and accurate photometric redshifts which will be of great value to the astronomical community.


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 >   2009B-0340

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