# Structure of the torus of the Active Galactic Nucleus

How much do we know about the structure of the torus surrounding the Active Galactic Nucleus (AGN)? Is the shape defined or still under speculations? And are there different structures for this torus possible i.e., does it vary from galaxy to galaxy?

• stp30 you've been asking a lot of general questions about AGN recently; it may be best to wait until you have a more specific question in mind. For example, typing 'AGN Torus' in to google gives a number of recent papers and discussions about the range of shapes of torii observed and theorised in the past decade May 28 '14 at 10:22

2. The yellow torus and the gray dashed lines are from $${\rm H}_2$$ emission.
4. The redish wobbly plane with the red (solid) arrows and the purple (dashed) arrows are sub-mm obseravtions ($${\rm CO/HCN/HCO^+}$$)
5. Bright green dots on the $$x$$-axis are $${\rm H_2 O}$$ maser emissions.