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We describe observations of aromatic features at 7.7 and 11.3 um in AGN ofthree types including PG, 2MASS and 3CR objects. The feature has beendemonstrated to originate predominantly from star formation. Based on thearomatic-derived star forming luminosity, we find that the far-IR emission ofAGN can be dominated by either star formation or nuclear emission; the averagecontribution from star formation is around 25% at 70 and 160 um. Thestar-forming infrared luminosity functions of the three types of AGN areflatter than that of field galaxies, implying nuclear activity and starformation tend to be enhanced together. The star-forming luminosity function isalso a function of the strength of nuclear activity from normal galaxies to thebright quasars, with luminosity functions becoming flatter for more intensenuclear activity. Different types of AGN show different distributions in thelevel of star formation activity, with 2MASS> PG> 3CR star formation rates.

Aromatic Features in AGN: Star-Forming Infrared Luminosity Function of AGN Host Galaxies