Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-04-12
Astronomy and Astrophysics
Astrophysics
accepted A&A Letters: 2 Fig., 4 pages
Scientific paper
According to the unified scheme, AGN are surrounded by a dust-torus, and the observed diversity of AGN properties results from the different orientations relative to our line of sight. The strong resonance of silicate dust at 10 micron is therefore, as expected, seen in absorption towards many type-2 AGN. In type-1 AGN, it should be seen in emission because the hot inner surface of the dust torus becomes visible. However, this has not been observed so far, thus challenging the unification scheme or leading to exotic modifications of the dust-torus model. Here we report the discovery of the 10 micron silicate feature in emission in two luminous quasars with the Infrared Spectrograph of the Spitzer Space Telescope.
Haas Marcel
Kr"ugel Endrik
Schulz Bailey
Siebenmorgen Ralf
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