Effects of baryons on weak lensing peak statistics

Understand

Upcoming weak-lensing surveys have the potential to become leading cosmological probes provided all systematic effects are under control.

• Recently, the ejection of gas due to feedback energy from active galactic nuclei (AGN) has been identified as major source of uncertainty, challenging the success of future weak-lensing probes in terms of cosmology.
• In this paper we investigate the effects of baryons on the number of weak-lensing peaks in the convergence field.
• Our analysis is based on full-sky convergence maps constructed via light-cones from $N$-body simulations, and we rely on the baryonic correction model of Schneider et al.