Speaker
Felix Vecchi
(EPFL)
Description
The all sky telescope, Euclid, will use weak lensing measurements of the distribution of matter in galaxy clusters to constrain cosmology. However, lensing is sensitive to all mass projected along the line-of-sight, meaning that intervening structures introduce systematic uncertainties. In this talk, I will show how we use the highest-resolution FLAMINGO hydrodynamical simulation to construct Euclid-like mock weak lensing maps, enabling us to quantify the extent of this systematic uncertainty. I will show that the uncertainties related to line-of-sight structure are significant, and if not taken into account can bias inferred properties of clusters and ultimately the estimates of cosmological parameters.
Author
Felix Vecchi
(EPFL)
Co-authors
David Harvey
(EPFL)
Ethan Tregidga
(EPFL)
