Peter,
Dense Disk and Torus Funnel at the Centre of the Circinus Galaxy (13 Mar 2014)
Although there is now a much clearer picture of a torus than before, there are some puzzles remaining: For example, both the dust disk and the polar dust have a temperature of about 300K (~30°C, i.e. about room temperature). Surprisingly, there is no evidence for hotter dust towards the centre as would be expected for a centrally heated dust distribution.
"The presence of both a bright disk-like component and a more extended polar dust component at a similar temperature were not predicted by the present models of active galactic nuclei", concludes Gerd Weigelt, director at the MPIfR and head of the research group for infrared astronomy.
Your galaxy evolution theory will need to incorporate the latest findings.
Alan