Speaker
Description
We present an improved component-wise baryonification model (BFC) that enhances dark-matter-only N-body simulations by generating particle-level outputs for gas, dark matter, and stars. We validate the model against FLAMINGO and TNG hydrodynamical simulations and demonstrate accurate reproduction of density and pressure profiles across a wide range of halo masses. Furthermore, the model is able to reconstruct the matter power spectra of the hydrodynamical simulations within 2% up to k=5h/Mpc at multiple redshifts. We apply the BFC framework to jointly interpret kinematic Sunyaev-Zel’dovich (kSZ) data from ACT and X-ray gas fractions from eROSITA, finding both data sets favor stronger baryonic feedback than assumed in many hydrodynamical simulations, contrasting with what was found using earlier gas fraction measurements. We also use the model to jointly analyze weak lensing, kSZ and X-ray data. We showcase that BFC offers a flexible, efficient, and self-consistent approach to modeling baryonic feedback effects across multiple cosmological observables.
