Large-scale structure and the intrinsic alignment of galaxies
  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.
