Date of Original Version
Copyright 2014 International Astronomical Union
Abstract or Description
Coherent alignments of galaxy shapes, often called “intrinsic alignments” (IA), are the most significant source of astrophysical uncertainty in weak lensing measurements. We develop the tidal alignment model of IA and demonstrate its success in describing observational data. We also describe a technique to separate IA from galaxy-galaxy lensing measurements. Applying this technique to luminous red galaxy lenses in the Sloan Digital Sky Survey, we constrain potential IA contamination from associated sources to be below a few percent.
Proceedings of the IAU Symposium, 308.