NOAO >   Observing Info >   Approved Programs >   2010B-0318

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Proposal Information for 2010B-0318


PI: Douglas Clowe, Ohio University, clowe@ohio.edu
Address: Physics Department, 251B Clippinger Labs, Athens, Ohio 45701, USA

CoI: David Johnston, Fermilab
CoI: Melville Ulmer, Northwestern University
CoI: James Annis, Fermilab
CoI: Jeffery Kubo, Fermilab
CoI: Kellen Murphy, Ohio University
CoI: Christophe Adami, Laboratoire d'Astrophysique de Marseille
CoI: Sahar Allam, Fermilab
CoI: Richard Kron, Univ. of Chicago
CoI: Douglas Tucker, Fermilab
CoI: Vicent Le Brun, Laboratoire d'Astrophysique de Marseille
CoI: Olivier Ilbert, Laboratoire d'Astrophysique de Marseille
CoI: Huan Lin, Fermilab
CoI: Carlo Schimd, Laboratoire d'Astrophysique de Marseille
CoI: Christophe Benoist, Observatoire de la Cote d'Azur
CoI: Raphael Gavazzi, Institut d'Astrophysique de Paris
CoI: Tim Schrabback, Universiteit Leiden
CoI: Loic Guennou, Laboratoire d'Astrophysique de Marseille

Title: Photometric Redshifts of 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



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