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We present the analysis of the Unidentified Infrared Bands (UIB) in thestarburst galaxy NGC 1097. We have combined spectral maps observed with theAKARI/IRC and Spitzer/IRS instruments, in order to study all of the mostprominent UIBs, from 3 to 20 micron. Such a complete spectral coverage iscrucial to remove the common degeneracies between the effects of the variationsof the size distribution and of the charge state of the grains. By studyingseveral UIB ratios, we show evidence that the average size of the UIB carriersis larger in the central region than in the circumnuclear ring. We interpretthis result as the selective destruction of the smallest grains by the hardradiation from the central active galactic nucleus.

Evolution of the Unidentified Infrared Bands in the Nucleus of the Starburst Galaxy NGC 1097