Joint Galaxy-Cluster Reconstruction

Prof. Matthias Bartelmann
University of Heidelberg

ABSTRACT: Understanding the internal constitution of galaxy clusters is an important task because simulations of cosmic structure formation routinely predict at least two universal characteristics for it: the density profile and the rich substructure. Galaxy clusters provide four different types of observables through which their internal constitution can be studied: gravitational lensing, X-ray emission, galaxy kinematics and the thermal Sunyaev-Zel’dovich effect. For a comprehensive and consistent analysis of galaxy clusters, all observables should be combined into a single model with the least prejudice possible. The talk will present a method allowing to combine all cluster observables on the common ground of the gravitational potential. Tests of the method with simulations have been promising, first applications to real clusters show that projected gravitational cluster potentials can indeed be well recovered.