Two-component model for the dust SED. It consists of a hot compact (0.̋14) component with Td = 100 K and an extended (1.̋5) component with Td = 40 K. For a gas-to-dust ratio the H2 column densities are N(H2) = 3 × 1022 and 2 × 1022, respectively. Luminosities are 1.1 × 109L⊙ for the compact component and 2.2 × 109L⊙ for the extended one. The observed SED points are marked as red squares and were taken from http://ned.ipac.caltech.edu/forms/photo.html. We used a modified black body to produce the SED. We calculate an optical depth at each wavelength and then we determine the dust temperature (modified by the optical depth). The mass absorption coefficients used can be found in González-Alfonso et al. (2014). We assume a standard gas-to-dust ratio of 100.
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