Euclid: Reconstruction of Weak Lensing mass maps for non-Gaussianity studies

Understand

Weak lensing, which is the deflection of light by matter along the line of sight, has proven to be an efficient method for constraining models of structure formation and reveal the nature of dark energy.

• So far, most weak-lensing studies have focused on the shear field that can be measured directly from the ellipticity of background galaxies.
• However, within the context of forthcoming full-sky weak-lensing surveys such as Euclid, convergence maps (mass maps) offer an important advantage over shear fields in terms of cosmological exploitation.
• While it carry the same information, the lensing signal is more compressed in the convergence maps than in the shear field.