Abstract
The concordance cosmological model: stress-tests with galaxy clusters. " We propose to address the tensions related to the measurements of the present value of Hubble constant H0 and of the galaxy cluster masses with a multi-wavelength homogenous joint analysis of these ultimate products of structure formation in time and mass. By assessing their mass scale, their mass distribution, the shapes of the hosting haloes and their distances (by combining X-ray and Sunyaev-Zeldovich signals), their number density and clustering with unique samples, we plan to constrain the most fundamental parameters describing the constituents of our Universe in the framework of the concordance cosmological Lambda Cold Dark Matter model, and we will quantify any tension within the current paradigm. " "The main goals of the project are: 1. Reconstruction of the pressure profile in the CHEX-MATE cluster sample for a precise and robust estimate of the thermodynamic quantities (both spatially resolved and integrated) and of the hydrostatic mass. Measurements of the weak-lensing masses, putting exquisite constraints on the hydrostatic bias. 2. Constraints on the triaxial shape of the distribution of both the gas and the dark matter. How the dark mass is concentrated and distributed, what is the gas mass fraction and how the gravitational acceleration manifests itself on different scales are all quantities influenced by cosmology, and therefore they provide incisive cosmological tests. 3. The knowledge of the triaxial shape and the independent measurements of the different dependence on the scale of the electron density from X-ray and SZ data will provide a unique estimate of H0. 4. The calibration of the scaling laws between weak-lensing masses and optical richness, among others, will allow us to convert the measurements of the number counts and clustering in the KiDS catalogs into powerful cosmological constraints."
Project details
Unibo Team Leader: Lauro Moscardini
Unibo involved Department/s:
Dipartimento di Fisica e Astronomia "Augusto Righi"
Coordinator:
Inaf - Istituto Nazionale Astrofisica(Italy)
Total Unibo Contribution: Euro (EUR) 71.501,00
Project Duration in months: 24
Start Date:
28/09/2023
End Date:
27/09/2025
