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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