Date of Original Version

4-16-2015

Type

Conference Proceeding

Rights Management

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.

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Published In

Proceedings of the IAU Symposium, 308.