Paper:	A New MIR/submm Diagnostic for Dust-Enshrouded AGN
Volume:	284, AGN Surveys, IAU Colloquium 184
Page:	205
Authors:	Haas, Martin
Abstract:	We show that the PAH 7.7 micron to continuum 850 micron flux ratio can be used to reveal high mid-infrared extinction in ultraluminous infrared galaxies (ULIRGs). While the sub-mm radiation is optically thin and represents the emission from essentially all dust grains, the PAH strength (measured by the peak height of the Polycyclic Aromatic Hydrocarbonates at 7.7 micron) is sensitive to dust extinction in the mid-infrared. As an application of the new diagnostics, after dereddening of the central mid-infrared continuum and with the assumption of a disk-like dust distribution seen under a tilted angle, we find increasing evidence for a hidden quasar in the archetypal ULIRG Arp220.

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