Abstract
MANY extragalactic objects—N-type Galaxies, Seyferts and QSOs—are strong emitters of infrared and millimetre-wave radiation1. For Seyfert galaxies the most likely model for the 2–20 µm radiation involves a central source of primary radiation surrounded by a shell of solid particles, the dust absorbing the primary radiation and re-emitting it in the infrared2. There is independent evidence for the presence of dust in the nuclei of Seyferts including detections of differential reddening of [S II] lines3. The formation of dust could occur in the expansion phases following explosions of massive (or supermassive) stars4 and the primary radiation may be in the form of ultraviolet photons, soft X rays or low energy cosmic-ray nucleons5.
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