Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-03-21
Astron.Astrophys. 404 (2003) 1-20
Astronomy and Astrophysics
Astrophysics
20 pages including 15 figures, accepted for publication by A&A
Scientific paper
10.1051/0004-6361:20030427
Two-dimensional radiative transfer is employed to obtain the broad-band infrared spectrum of active galaxies. In the models we vary the geometry and size of the obscuring medium, the surface density, the opacity and the grain size distribution. Resulting spectral energy distributions are constructed for different orientations of the toroid. Colour-colour comparisons with observational data are consistent with previous observations that the emission longward of 60 micron is produced by star-formation and unrelated to the presence of an obscuring torus. We also find that the toroid cannot be flat, but is rather conical or flaring. The density is most likely constant with radius, and the size is relatively large with an inner radius around 10 pc. A direct comparison with radio galaxy Cygnus A yields a best fit for a conical disk with constant surface density, and a size from 10 to 30 pc assuming the far-infrared emission is due to star-formation in the host galaxy.
Dullemond Cornelis Petrus
van Bemmel Ilse M.
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