Stellar Mass Fractions in a Sample of SPT-selected, WL-calibrated Galaxy Clusters
Institution: Universitätssternwarte (USM), LMU Munich, Germany
Advisors: Prof. J. Mohr, Dr. M. Klein
Period: June 2024 - August 2024
Overview
This project focused on updating stellar mass estimates of a sample of SPT-selected, WL-calibrated galaxy clusters and their comparison with similar quantities from hydrodynamical cosmological simulations. The results indicate significant deviations between observations and simulations. Some simulations, such as IllustrisTNG and FLAMINGO, show better agreement, whereas others, including Magneticum, BAHAMAS, and C-OWLs, deviate more strongly. A key reason for these discrepancies is whether the intra-cluster light (ICL) and the brightest cluster galaxy (BCG) are included in the total stellar mass or not. Another point was the different cosmological parameters adopted by the simulations.
Research Activities
- Updated stellar mass fractions of SPT-selected galaxy clusters with new weak-lensing constraints
- Developed and implemented MCMC routines to fit the scaling relation between stellar mass and halo mass
- Discovered a flatter stellar-to-halo mass relation than previously reported
- Identified and quantified discrepancies between observations and simulations