ISO observations of active galaxies

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Active Galaxies

Scientific paper

ISO observed essentially all classes of active galactic nuclei (AGN), providing more sensitive, extensive and detailed photometry than IRAS plus images and the first high quality spectra over the complete 2.5-200 μm range. In this brief review I will focus on a few selected scientific topics where early results indicate that ISO has or is likely to make a significant impact. These include i) the nature of the far infrared emission of quasars, radio galaxies and Seyfert galaxies, ii) origin of the hot dust continuum and PAH emission features in Seyfert galaxies, iii) use of fine structure lines to determine the shape of the photoionizing continuum and to investigate the origin of the line asymmetries in Seyferts, iv) the pumping mechanism in OH megamasers, and v) the use of infrared diagnostics to distinguish between starburst and AGN activity in Ultraluminous Infrared and other highly obscured galaxies.

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