Unifying cluster and galaxy cosmology analyses using the galaxy-halo connection
Abstract
Galaxies and galaxy clusters trace the same cosmic density field, but their statistics have been modeled separately in cosmological analyses. We present a unified, simulation-based framework to model them using the galaxy-halo connection. Our analysis includes cluster lensing, galaxy clustering, and galaxy-cluster cross-correlation. We validate our method on the FLAMINGO hydrodynamic simulation. Relative to the cluster-only approach, combining these probes improves the σ8-m figure of merit by a factor of 15. Our framework enables stringent tests of cosmological models and exploits small-scale information.
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