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Fig. 4


Surface brightness maps of PAH emission at the tip of IC 63. The maps are 13 × 9 pixels (3.6′′/pixel) in size. They have been overlayed on top of a three-color image made from DSS (blue), IRAC 8.0 μm (green) and PACS 160 μm images (red). The star γ Cas is located ~20 arcmin to the southwest of the tip (see also Fig. 1). The maps have been normalized to their maximum peak value, and we have overplotted the contours of the 11.3 μm band spatialdistribution for comparison. The white square in the first map indicates the region (along the second front) where the PAH emission is the brightest, and whose average spectrum is shown in Fig. 3.

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