SPHEREx maps of 3.3-µm PAH and Brα emission show systematic PAH depletion inside ionized regions across the Galactic plane, with ionizing radiation as a dominant driver of abundance variations.
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SPHEREx mapping of diffuse PAH and H II emission in the Galactic plane
SPHEREx maps of 3.3-µm PAH and Brα emission show systematic PAH depletion inside ionized regions across the Galactic plane, with ionizing radiation as a dominant driver of abundance variations.