Dust Content, Galaxy Orientations, and Shape Noise in Imaging Surveys
  We show that dust absorption in disk galaxies leads to a color- and
orientation-dependent centroid shift which is expected to be observable in
multi-band imaging surveys. This centroid shift is an interesting new probe
which contains astrophysically and cosmologically relevant information: it can
be used to probe the dust content of a large sample of galaxies, and to reduce
the shape noise due to inclination of disk galaxies for weak lensing shear.
Specifically, we find that data sets comparable to CFHTLenS, the Dark Energy
Survey (DES) or the Hyper Suprime-Cam (HSC) survey should provide a dust
measurement for several hundred galaxies per square degree. Conversely, given
knowledge of the dust optical depth, this technique will significantly lower
the shape noise for the brightest galaxies in the sample (signal-to-noise
greater than a few hundred), thereby increasing their relative importance for
the weak lensing shear measurement.
