Galaxy Halo Masses from Weak Gravitational Lensing
  In this review, I discuss the use of galaxy-galaxy weak lensing measurements
to study the masses of dark matter halos in which galaxies reside. After
summarizing how weak gravitational lensing measurements can be interpreted in
terms of halo mass, I review measurements that were used to derive the
relationship between optical galaxy mass tracers, such as stellar mass or
luminosity, and dark matter halo mass. Measurements of galaxy-galaxy lensing
from the past decade have led to increasingly tight constraints on the
connection between dark matter halo mass and optical mass tracers, including
both the mean relationships between these quantities and the intrinsic scatter
between them. I also review some of the factors that can complicate analysis,
such as the choice of modeling procedure, and choices made when dividing up
samples of lens galaxies.
