Modeling the submm continuum emission of J0439+1634 using SKIRT. Top left: the reconstructed source-plane surface brightness. Top middle: the best-fit SKIRT model. Top right: the residual. Bottom left: the dust temperature map of the best-fit model. Bottom middle: the flux ratio between the no-AGN model and the best-fit model. Bottom right: the 1D profile of the source-plane surface brightness, the best-fit model, and the no-AGN model, where the X-axis is the semimajor axes of the elliptical annuli (see the main text). AGN-heated dust dominates the submm flux at r ≲ 100 pc, while the outer region is dominated by star-heated dust.