Program: GS-2020B-Q-209

Galactic winds are a critical component in the life cycle of every galaxy. These outflows of ionized gas are driven the energy injected into the galaxy's interstellar medium through supernovae and the radiation pressure of young stars, partially regulating the material available for star formation. How these outflows are influenced by the environment surrounding the galaxy is poorly understood. The expectation is that the hot intracluster medium (ICM) that permeates the cluster will suppress outflows. However, this hypothesis requires observational evidence of Mg II absorption of star-forming galaxies in clusters. We propose to observe 16 star-forming galaxies in the z = 1.062 galaxy cluster SPT-CL J0546-5345 to determine how the outflows hosted in this cluster differ from their contemporaries in the field. By observing the rest-frame optical spectra of these satellite galaxies, we will address whether star-forming cluster galaxies host outflows and how the strength and velocity structure of any detected outflows compare to field samples. The result of this campaign will unveil how the galactic winds experienced by star-forming cluster galaxies influence quenching of star formation, and are influenced by the local ICM.