Discovery of 10 μ m silicate emission in quasars . Evidence of the AGN unification scheme

Discovery of 10 µm silicate emission in quasars. Evidence of the AGN unification scheme. Abstract. 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 µm 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 µm silicate feature in emission in two luminous quasars with the Infrared Spectrograph of the Spitzer Space Telescope.