Year: 2018
Type: article
Abstract: The ΛCDM model of structure formation makes strong predictions on the concentration and shape of dark matter (DM) halos, which are determined by mass accretion processes. Comparison between predicted shapes and observations provides a geometric test of the ΛCDM model. Accurate and precise measurements needs a full three-dimensional (3D) analysis of the cluster mass distribution. We accomplish this with a multi-probe 3D analysis of the X-ray regular Cluster Lensing and Supernova survey with Hubble (CLASH) clusters combining strong and weak lensing, X-ray photometry and spectroscopy, and the Sunyaev–Zel’dovich effect (SZe). The cluster shapes and concentrations are consistent with ΛCDM predictions. The CLASH clusters are randomly oriented, as expected given the sample selection criteria. Shapes agree with numerical results for DM-only halos, which hints at baryonic physics being less effective in making halos rounder.
Institutions: Osservatorio di Astrofisica e Scienza dello Spazio, National Institute for Astrophysics, University of Bologna, Institute of Astronomy and Astrophysics, Academia Sinica, Academia Sinica, Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, California Institute of Technology, Instituto de Física de Cantabria, University of Pennsylvania, Ben-Gurion University of the Negev
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2795446996