Galaxy Halo Masses from Weak Gravitational Lensing

Abstract

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.

arXiv comment10 pages, 1 figure; to appear in IAU Symp. 311, Galaxy Masses as Constraints of Formation Models, eds. M. Cappellari & S. Courteau, (Cambridge: Cambridge Univ. Press), in press

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