Assigned ID: 819 ----- Attempting Submission 1 (Sat Mar 08 00:08:58 GMT 2008) ----- We propose a next-generation weak gravitational lensing analysis of the Hubble Space Telescope COSMOS field with shapelets, an advanced shear measurement method. Shapelets have been shown to perform as well as or better than other methods on ground-based images, and are expected to be a premier tool for upcoming space-based weak lensing surveys. COSMOS ACS/WFC images are ideal to optimize our shapelets pipeline for space-based images. In particular, they will allow us to optimize the control on systematic errors by using the unique ability of shapelets to provide several shear estimators from high-resolution imaging. We will also improve the galaxy fitting procedure used by shapelets by introducing a technical innovation based on wavelets. We will then create an improved shear catalog of the COSMOS field. Combined with new, more accurate photometric redshifts, this will allow us to significantly improve the weak lensing analysis of this field. Most importantly, the robust control of systematic errors that shapelets provide will allow us to measure the weak lensing three-point correlation function, thus improving on previous constraints on cosmological parameters.

COSMOLOGY 12 50000 false 0.0 0.0 false false false false false SUPPORTED