Program: GN-2007A-Q-49
Title: | Locating the silicate emission in NGC2110 |
PI: | Rachel Mason |
Co-I(s): | Yong Shi, Joseph Rhee, Varoujan Gorjian, Michael Werner, Kieran Cleary, Chris Packham |
Abstract
The unified model of active galactic nuclei (AGN), in which orientation-dependent obscuration accounts for the differences between active galaxies of types 1 and 2, predicts a 10 micron silicate absorption feature in type 2 objects and strong silicate emission from the torus in the type 1s. The silicate feature is indeed observed in absorption, albeit weakly, in many type 2 AGN, but until recently the corresponding emission feature had only been securely detected in a single type 1 Seyfert galaxy. This has posed a great problem for models attempting to explain and predict the IR emission from the dusty AGN torus. In recent months, silicate emission features have been found in Spitzer spectra not only of several type 1 objects, but also of a number of **type 2** nuclei. However, as the apertures used for that work span hundreds if not thousands of parsecs on the galaxies, it is not known whether the emission feature arises in the torus itself or in extended dust of the type shown by ground-based mid-IR imaging to exist in several AGN. To distinguish between these possibilities we therefore propose a Michelle spectroscopic study of NGC2110, a bright type 2 AGN whose Spitzer spectrum shows a silicate feature in emission, and at 30 Mpc (1"=150 pc) by far the closest such galaxy yet discovered.
Publications using this program's data
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[data]
[ADS] The Origin of the Silicate Emission Features in the Seyfert 2 Galaxy NGC 2110
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[data]
[ADS] Nuclear Star Formation Activity and Black Hole Accretion in Nearby Seyfert Galaxies
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[data]
[ADS] The subarcsecond mid-infrared view of local active galactic nuclei - I. The N- and Q-band imaging atlas
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[data]
[ADS] Nuclear obscuration in LINERs. Clues from Spitzer/IRS spectra on the Compton thickness and the existence of the dusty torus
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[data]
[ADS] The nuclear and extended mid-infrared emission of Seyfert galaxies
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[data]
[ADS] A mid-infrared statistical investigation of clumpy torus model predictions
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[data]
[ADS] Torus model properties of an ultra-hard X-ray selected sample of Seyfert galaxies
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[data]
[ADS] Active Galactic Nucleus Ghosts: A Systematic Search for Faded Nuclei
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[data]
[ADS] On the origin of X-ray oxygen emission lines in obscured AGN
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[data]
[ADS] Torus and polar dust dependence on active galactic nucleus properties