Baryonic feedback effects lead to a suppression of the weak lensing angular power
spectrum on small scales. The poorly constrained shape and amplitude of this suppression
is an important source of uncertainties for upcoming cosmological weak lensing surveys
such as Euclid or LSST. In this first paper in a series of two, we use simulations to build a
Euclid-like tomographic mock data-set for the cosmic shear power spectrum and the
corresponding covariance matrix, which are both corrected for baryonic effects following the�…

An accurate modelling of baryonic feedback effects is required to exploit the full potential of
future weak-lensing surveys such as Euclid or LSST. In this second paper in a series of two,
we combine Euclid-like mock data of the cosmic shear power spectrum with an eROSITA X-
ray mock of the cluster gas fraction to run a combined likelihood analysis including both
cosmological and baryonic parameters. Following the first paper of this series, the baryonic
effects (based on the baryonic correction model of ref.[1]) are included in both the�…