AGN DUSTY TORI AS A CLUMPY TWO-PHASE MEDIUM: THE 10 mu m SILICATE FEATURE

作者：Stalevski Marko^*; Fritz Jacopo; Baes Maarten; Nakos Theodoros; Popovic Luka C

来源：Baltic Astronomy, 2011, 20(3): 490-494.

• galaxies: active, nuclei, Seyfert
• radiative transfer

We investigated the emission of active galactic nuclei dusty tori in the infrared domain, with a focus on the 10 mu m silicate feature. We modeled the dusty torus as a clumpy two-phase medium with high-density clumps and a low-density medium filling the space between the clumps. We used a three-dimensional radiative transfer code to obtain spectral energy distributions and images of tori at different wavelengths. We calculated a grid of models for different parameters and analyzed the influence of these parameters on the shape of the mid-infrared emission. A corresponding set of clumps-only models and models with a smooth dust distribution is calculated for comparison. We found that the dust distribution, the optical depth and a random arrangement of clumps in the innermost region, all have an impact on the shape and strength of the silicate feature. The 10 mu m silicate feature can be suppressed for some parameters, but models with smooth dust distribution are also able to produce a wide range of the silicate feature strength.

• 出版日期2011