Photometric Redshifts of Weak Lensing Tomography of Galaxy Clusters

Details Photometric Redshifts of Weak Lensing Tomography of Galaxy Clusters Photometric Redshifts of Weak Lensing Tomography of Galaxy Clusters

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010noao.prop..318c&link_type=abstract

NOAO Proposal ID #2010B-0318

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Scientific paper

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.

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