The 3.3 um PAH feature grows relative to 7.7 and 11.3 um features at low metallicity, with secondary radiation-field-driven variations, indicating smaller PAH populations in low-metallicity environments.
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Variations in the 3.3 ${\mu}$m Polycyclic Aromatic Hydrocarbon Feature Across Nearby Galaxies Driven by Metallicity and Radiation Field Spectrum
The 3.3 um PAH feature grows relative to 7.7 and 11.3 um features at low metallicity, with secondary radiation-field-driven variations, indicating smaller PAH populations in low-metallicity environments.