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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 660628.0, MPI für Astronomie / Publikationen_mpia
The complexity of parsec-scaled dusty tori in AGN
Authors:Tristram, K. R. W.; Schartmann, M.; Burtscher, L.; Meisenheimer, K.; Jaffe, W.; Kishimoto, M.; Hönig, S. F.; Weigelt, G.
Date of Publication (YYYY-MM-DD):2012-01
Journal Abbrev.:Journal of Physics Conference Series
Issue / Number:1
Start Page:012035
Audience:Not Specified
Abstract / Description:Warm gas and dust surround the innermost regions of active galactic nuclei (AGN). They provide the material for accretion onto the super-massive black hole and they are held responsible for the orientation-dependent obscuration of the central engine. The AGN-heated dust distributions turn out to be very compact with sizes on scales of about a parsec in the mid-infrared. Only infrared interferometry currently provides the necessary angular resolution to directly study the physical properties of this dust. Size estimates for the dust distributions derived from interferometric observations can be used to construct a size-luminosity relation for the dust distributions. The large scatter about this relation suggests significant differences between the dust tori in the individual galaxies, even for nuclei of the same class of objects and with similar luminosities. This questions the simple picture of the same dusty doughnut in all AGN. The Circinus galaxy is the closest Seyfert 2 galaxy. Because its mid-infrared emission is well resolved interferometrically, it is a prime target for detailed studies of its nuclear dust distribution. An extensive new interferometric data set was obtained for this galaxy. It shows that the dust emission comes from a very dense, disk-like structure which is surrounded by a geometrically thick, similarly warm dust distribution as well as significant amounts of warm dust within the ionisation cone.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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