Galaxy Halo Masses from Weak Gravitational Lensing

TL;DR

This review discusses how galaxy-galaxy weak lensing measurements are used to determine the relationship between galaxy properties and dark matter halo masses, highlighting recent advances and challenges.

Contribution

It provides a comprehensive overview of recent measurements linking optical galaxy tracers to dark matter halo masses using weak lensing data.

Findings

Tight constraints on the galaxy-halo mass relationship.

Quantification of intrinsic scatter between galaxy properties and halo mass.

Analysis of factors affecting weak lensing measurements.

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.