Submission failed communicating with the submission server: java.rmi.ConnectException: Connection refused to host: 130.167.201.116; nested exception is: java.net.ConnectException: Operation timed out Assigned ID: 508 ----- Attempting Submission 1 (Fri Feb 24 17:32:35 GMT 2012) ----- Weak gravitational lensing (WL), the deflection of light from distant source galaxies due to the mass in intervening lenses, is a measurement technique that will be used to constrain dark matter and dark energy in several upcoming, wide-field imaging surveys. We propose to carry out HST archival research that will reduce a limiting systematic error in WL measurements, the estimation of galaxy shapes and therefore coherent WL distortions, in the presence of the larger (and coherent) distortions due to the point-spread function (PSF). In particular, we will produce and publicly release a training dataset covering ~380 square arcmin, consisting of homogeneously-analyzed galaxies observed in at least two orbits and typically two bands (F606W and F814W), each with a PSF estimate and a detailed understanding of the anisotropic, correlated noise in the images. This training data can be used as input for public simulation software that produces mock galaxy data to test the performance of WL analysis methods on realistic galaxies; it is complementary to a previous release of training data based on single-orbit F814W data from COSMOS. The inclusion of a sufficiently large quantity of deep training data from HST is crucial for identifying biases in WL shape measurements due to deviations of galaxies from simple parametric models, such as have been used in the majority of WL simulations to date. This training data will help future lensing surveys to achieve their enormous potential, and will be a lasting legacy for the astronomical community due to its utility for many other scientific applications (e.g., galaxy morphologies). COSMOLOGY 12 Legacy false 0.0 0.0 false false false false SUPPORTED