  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.
