Mapping Dark Matter in Galaxy Clusters: Gravitational Lensing & Numerical Simulations

TL;DR

This paper reviews the use of gravitational lensing and numerical simulations to map dark matter in galaxy clusters, focusing on substructures, mass profiles, and inner dark matter slopes.

Contribution

It presents a comprehensive review of gravitational lensing techniques applied to galaxy clusters and compares observational results with numerical simulations.

Findings

Weak galaxy-galaxy lensing reveals environment effects on substructures.

Combined strong and weak lensing constrains the mass profile of Abell 1689.

Strong lensing measures the inner dark matter slope of Abell 1703.

Abstract

The different regimes of gravitational lensing constitutes an interesting tool in order to map the mass distribution in galaxy clusters on different scales. In this proceedings article, I review some work I have performed on this topic. More precisely, I will focus on : (i) galaxy scale substructures, using weak galaxy-galaxy lensing in order to study how does the environment shape their properties; (ii) the mass profile of Abell~1689 as probed combining strong and weak lensing; (iii) the slope of the inner dark matter distribution in Abell~1703 as measured by strong lensing. The lensing results will be compared to the expectations from numerical simulations, when available.