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In the widely accepted 'Unified Model' solution of the classification puzzleof Active Galactic Nuclei, the orientation of a dusty accretion torus aroundthe central black hole dominates their appearance. In 'type-1' systems, thebright nucleus is visible at the centre of a face-on torus. In 'type-2' systemsthe thick, nearly edge-on torus hides the central engine. Later studiessuggested evolutionary effects and added dusty clumps and polar winds but leftthe basic picture intact. However, recent high-resolution images of thearchetypal type-2 galaxy NGC 1068 suggested a more radical revision. Theydisplayed a ring-like emission feature which the authors advocated to be hotdust surrounding the black hole at the radius where the radiation from thecentral engine evaporates the dust. That ring is too thin and too far tiltedfrom edge-on to hide the central engine, and ad hoc foreground extinction isneeded to explain the type-2 classification. These images quickly generatedreinterpretations of the type 1-2 dichotomy. Here we present new multi-bandmid-infrared images of NGC1068 that detail the dust temperature distributionand reaffirm the original model. Combined with radio data, our maps locate thecentral engine below the previously reported ring and obscured by a thick,nearly edge-on disk, as predicted by the Unified Model. We also identifyemission from polar flows and absorbing dust that is mineralogically distinctfrom that towards the Milky Way centre.

Thermal imaging of dust hiding the black hole in the Active Galaxy NGC 1068