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• W3104374308 abstract "<i>Context. <i/>High angular resolution <i>N<i/>-band imaging is used to discern the torus of active galactic nuclei (AGN) from its environment in order to allow a comparison of its mid-infrared properties to the expectations of the unified scenario for AGN.<i>Aims. <i/>We present VLT-VISIR images of 25 low-redshift AGN of different Seyfert types, as well as <i>N<i/>-band SEDs of 20 of them. In addition, we compare our results for 19 of them to <i>Spitzer<i/> IRS spectra.<i>Methods. <i/>We find that at a resolution of ~035, all the nuclei of our observed sources are point-like, except for 2 objects whose extension is likely of instrumental origin. For 3 objects, however, we observed additional extended circumnuclear emission, even though our observational strategy was not designed to detect it. Comparison of the VISIR photometry and <i>Spitzer<i/> spectrophotometry indicates that the latter is affected by extended emission in at least 7 out of 19 objects and the level of contamination is . In particular, the 10 <i>μ<i/>m silicate emission feature seen in the <i>Spitzer<i/> spectra of 6 type I AGN, possibly 1 type II AGN and 2 LINERs, also probably originates not solely in the torus but also in extended regions.<i>Results. <i/>Our results generally agree with the expectations from the unified scenario, while the relative weakness of the silicate feature supports clumpy torus models. Our VISIR data indicate that, for low-redshift AGN, a large fraction of <i>Spitzer<i/> IRS spectra are contaminated by extended emission close to the AGN." @default.
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• W3104374308 date "2009-01-14" @default.
• W3104374308 modified "2023-10-05" @default.
• W3104374308 title "Mid-infrared imaging of 25 local AGN with VLT-VISIR" @default.
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• W3104374308 doi "https://doi.org/10.1051/0004-6361:200809878" @default.
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