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We present spatial distribution of polycyclic aromatic hydrocarbons andionized gas within the Galactic giant HII region NGC3603. Using the IRSinstrument on board the Spitzer Space Telescope, we study in particular the PAHemission features at ~5.7, 6.2, 7.7, 8.6, and 11.3um, and the [ArII] 6.99um,[NeII] 12.81um, [ArIII] 8.99um, and [SIV] 10.51um forbidden emission lines. Theobservations probe both ionized regions and photodissociation regions. Silicateemission is detected close to the central cluster while silicate absorption isseen further away. We find no significant variation of the PAH ionizationfraction across the whole region. The emission of very small grains lies closerto the central stellar cluster than emission of PAHs. The PAH/VSG ratioanticorrelates with the hardness of the interstellar radiation field suggestinga destruction mechanism of the molecules within the ionized gas, as shown forlow-metallicity galaxies by Madden et al. (2006).

PAH Strength and the Interstellar Radiation Field around the Massive Young Cluster NGC3603