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AGN: Accretion onto SMBH UV, Opt, X-ray, ... Accretion Disk “Torus” Obscurer <0.1pc 10pc 10 kpc Galactic Center gas Star forming regions e.g. in spiral arms 1 kpc Nuclear obscuration Galaxy-scale obscuration How is it stable and extended? Density? Substructure? Feeding of AGN? First constraint: - Column density - Covering fraction