Linearly-scaled 3.3 μm continuum-free PAH feature emission from Cen A, derived from the subtraction of the scaled NB_3.21 data from the NB_3.28 data (see text) and spatially smoothed by an 8 × 8 boxcar. The bar in the lower right corner of each panel illustrates 200 pc at the distance to Cen A. The wedges to the right show relative surface brightness levels. The bottom panel shows a blowup of the central region to better illustrate details (including four prominent spots indicated with arrows, the nearly circular clumpy ring surrounding the nucleus (see also the blow-up of this ring in Fig. 11), and the faint arc-like feature north of the nucleus at about () described in the text. Logarithmically-spaced contours are drawn at the levels 0.60, 0.90, 1.34, and 2.00 in the arbitrary units of the map.
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