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A New MIR/submm Diagnostic for Dust-Enshrouded AGN

Published online by Cambridge University Press:  12 April 2016

Martin Haas
Martin Haas*
Affiliation:
Max-Planck-Institut für Astronomie, D-69117 Heidelberg, Germany

Abstract

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We show that the PAH 7.7μm to continuum 850μm flux ratio can be used to reveal high mid-infrared extinction in ultraluminous infrared galaxies (ULIRGs). While the submm 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 Hydocarbonates at 7.7μm) is sensitive to dust extinction in the mid-infrared (MIR). As an application of the new diagnostic, after dereddening of the central MIR 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.

Type
Part 2. Infrared and Submillimeter Surveys for AGN
Information
International Astronomical Union Colloquium , Volume 184: AGN Surveys , 2002 , pp. 205 - 212
Copyright
Copyright © Astronomical Society of the Pacific 2002

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