The typical AGN is made of several components
An accretion disk where matter is funneled onto the SMBH.
A broad line region (BLR) where the broad and optical/UV lines are produced. Reverberation mapping studies have shown that the inner radius of this region scales with the luminosity and is ~10-100 light days (e.g., Kaspi et al. 2005).
A molecular torus, which is located within few parsecs from the SMBH. Near-IR reverberation studies have shown that the inner radius of the torus also scales with the luminosity (Suganuma et al. 2006).
A narrow line region (NLR), which is located at ~100-300 pc from the SMBH, where the narrow optical lines are created.
|Typical structure (not on scale) of an AGN. Download figure (jpeg, pdf)|