Cluster-galaxy weak lensing

Abstract

Weak gravitational lensing of background galaxies provides a direct probe of the projected matter distribution in and around galaxy clusters. Here, we present a self-contained pedagogical review of cluster-galaxy weak lensing, covering a range of topics relevant to its cosmological and astrophysical applications. We begin by reviewing the theoretical foundations of gravitational lensing from first principles, with a special attention to the basics and advanced techniques of weak gravitational lensing. We summarize and discuss key findings from recent cluster-galaxy weak-lensing studies on both observational and theoretical grounds, with a focus on cluster mass profiles, the concentration-mass relation, the splashback radius, and implications from extensive mass-calibration efforts for cluster cosmology.