Infrared spectra of obscuring dust tori around active galactic nuclei. I - Calculational method and basic trends

Details Infrared spectra of obscuring dust tori around active galactic nuclei. I - Calculational method and basic trends Infrared spectra of obscuring dust tori around active galactic nuclei. I - Calculational method and basic trends

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401...99p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 401, no. 1, p. 99-109.

Astronomy and Astrophysics

Astrophysics

353

Active Galactic Nuclei, Infrared Spectra, Interstellar Matter, Toruses, Active Galaxies, Emission Spectra, Power Spectra, Radiation Distribution, Radiative Transfer, Seyfert Galaxies

Scientific paper

Using a new 2D radiative transfer algorithm, we have calculated the thermally reradiated infrared spectra of the compact dust tori which are thought to surround many AGN. These tori radiate anisotropically. Face-on tori may be from one-half to a few orders of magnitude brighter than edge-on tori throughout the infrared. Their spectra at nearly all viewing angles are basically 'bumps' which are about 50 percent wider than blackbodies and peak in the mid-infrared at a wavelength determined mainly by the flux of nuclear radiation on the inner edge of the torus. The infrared color temperatures are hotter for face-on tori than edge-on tori by about 100 K. The 10 micron silicate feature often associated with dust can appear in absorption, emission, or not at all. There is a rough tendency for absorption features to be more prominent for edge-on tori than for face-on tori.

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