Forward modeling of galaxy kinematics in slitless spectroscopy

Slitless spectroscopy has usually been considered as a complicated technique, plagued by self- and cross-confusion effects. However, since the era of space-based instruments, it has become an adopted survey tool to study large galaxy samples. We will present its application to single object studies, with a method to extract both more precise redshifts and potentially resolved kinematic parameters of galaxies. Our approach is based on a forward model of the 2D slitless spectrum of a galaxy under thin cold disk and spectro-spatial separability hypotheses. We apply this method to 3D-HST and GLASS observations and first results on kinematic measurements will be presented. There are promising applications to future slitless spectroscopy surveys such as EUCLID (but also JWST and WFIRST) which will possess a better spectral resolution and a larger number of targets.