Weak Lensing with Sizes, Magnitudes and Shapes

Understand

Weak lensing can be observed through a number of effects on the images of distant galaxies; their shapes are sheared, their sizes and fluxes (magnitudes) are magnified and their positions on the sky are modified by the lensing field.

• Galaxy shapes probe the shear field whilst size, magnitude and number density probe the convergence field.
• Both contain cosmological information.
• In this paper we are concerned with the magnification of the size and magnitude of individual galaxies as a probe of cosmic convergence.