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Title:
Silicate Emission in AGN: Emission from the Torus or (and) Extended Emission?
Authors:
Schweitzer, M.; Lutz, D.; Sturm, E.; Genzel, R.; Veilleux, S.; Rupke, D.; Kim, D.-C.; Baker, A. J.; Groves, B.; Tomono, D.; Netzer, H.; Sternberg, A.
Publication:
The Central Engine of Active Galactic Nuclei, ASP Conference Series, Vol. 373, proceedings of the conference held 16-21 October, 2006 at Xi'an Jioatong University, Xi'an, China. Edited by Luis C. Ho and Jian-Min Wang, p.501
Publication Date:
10/2007
Origin:
ASP
Bibliographic Code:
2007ASPC..373..501S

Abstract

Spitzer spectroscopy has recently given a new boost to AGN studies by detecting long-sought silicate emission features in quasars, but it remains uncertain how they can be interpreted in unified scenarios. Hot silicate emission may arise from a compact torus, but the moderate temperature of the actually observed silicate emission and our detection of this feature in QSO-2s argue for a more extended nature. Support for this comes from our recent detection of extended silicate emission in the low-luminosity LINER NGC 3998 and spectral modelling of our QSO-1 sample.
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