Resolved Star Formation in Galaxies Using Slitless Spectroscopy

The ability to spatially resolve individual star-formation regions in distant galaxies and simultaneously extract their physical properties via emission lines is a critical step forward in studying the evolution of galaxies. Rather than taking a blurry view of the summed properties of galaxies, our methodology allows us to paint a detailed picture of how star-formation behaves in galaxies over a wide range of redshifts. Here, we present our study of resolved star formation derived using HST/WFC3 IR slitless observations. The unique capabilities of the WFC3 IR Grism allows us to accurately identify the exact spatial origin of emission lines in galaxies and determine how star-formation occurs within a galaxy. Using multiple position angles on the sky, we show that we can accurately derive both the location and the observed wavelengths of these emission lines, which is crucial to derive accurate redshifts for these sources.