Cosmological zoom-in simulations find that grain-grain shattering in diffuse ISM gas drives rising PAH mass fraction with time, naturally producing the observed PAH-metallicity relation and inverse qPAH-molecular gas trends.
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JWST observations of z~1.1 galaxies produce PAH ratio maps showing larger and more neutral PAHs at larger radii, opposite local trends, linked to UV hardness via photo-destruction.
New CO observations of low-mass late-type galaxies show the molecular gas-star formation relation remains linear, with shorter depletion times and a shift toward molecular-dominated gas at higher stellar masses.
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The Lifecycle and Emission Properties of PAHs in Cosmological Hydrodynamic Galaxy Formation Simulations
Cosmological zoom-in simulations find that grain-grain shattering in diffuse ISM gas drives rising PAH mass fraction with time, naturally producing the observed PAH-metallicity relation and inverse qPAH-molecular gas trends.