Weak Lensing in a Brave New Systematic World

Weak lensing cosmological surveys have passed an inflection point – shifting from being limited by the statistics of the measured galaxy populations to becoming limited by the systematics in those measurements. Two of the dominant effects are: (1) accurately obtaining distances to galaxies (photometric redshifts, photo-zs), and (2) understanding if and how much galaxy shapes intrinsically align with one another (IA). I will discuss a cross-collaboration, ongoing research program that will comprehensively address both of these systematic effects by constraining the color-redshift relation for deep galaxy populations with precisely targeted spectroscopic observation and enable full forward modeling of the redshift inference. These data jointly with shape catalogs also enable probes of IA parameters in terms of both color and luminosity