Emulation of baryonic effects on the matter power spectrum and constraints from galaxy cluster data

Understand

Baryonic feedback effects consist of a major systematic for upcoming weak-lensing and galaxy-clustering surveys.

• In this paper, we present an emulator for the baryonic suppression of the matter power spectrum.
• The emulator is based on the baryonification model, containing seven free parameters that are connected to the gas profiles and stellar abundances in haloes.
• We show that with the baryonic emulator, we can not only recover the power spectra of hydro-dynamical simulations at sub-percent precision but also establish a connection between the baryonic suppression of the power spectrum and the gas and stellar fractions in haloes.