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The ionizing photons produced by massive stars are key actors in galaxyevolution. Ionizing photon production and escape is poorly understood. Improvedspace-based, spatially-resolved, multiplexed spectroscopic capabilitiescovering observed wavelengths of 1000 to 3000 Angstrom, in concert withspectroscopy from the ELTs and JWST, would lead to definitive answers as to howionizing photons are produced and leaked, what populations of galaxies areresponsible for ionizing photon leakage, what determines whether escape ispossible, and how ionizing galaxy populations evolve over cosmic time.

The production and escape of ionizing photons from galaxies over cosmic time (Astro2020 Science White Paper)