NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-18 T23:47:07 PDT
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For refcode 1993ApJ...418..673P:
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Copyright by American Astronomical Society. Reproduced by permission
1993ApJ...418..673P INFRARED SPECTRA OF OBSCURING DUST TORI AROUND ACTIVE GALACTIC NUCLEI. II. COMPARISON WITH OBSERVATIONS EDWARD A. PIER AND JULIAN H. KROLIK Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218 Received 1993 February 11; accepted 1993 June 7 ABSTRACT In a previous paper we computed the IR properties predicted for the dusty obscuring tori believed to surround many AGNs. Here we make a detailed comparison of the predictions with published observations. We find good agreement between the model predictions and the observed continuum of NGC 1068, the 3.5-10.5 micron colors of type 2 Seyfert galaxies, the observed range in behavior of the 10 micron silicate feature and 8-13 micron spectral index in both types of Seyfert galaxies, and several examples of anisotropy in the IR emission from AGNs. To explain the IR continua of type 1 Seyfert galaxies and quasars, we suggest that a small amount of dust may exist well inside the inner edge of the torus proper and that the host galaxy often dominates in the far- infrared. If this description of the near-IR continua is correct for quasars, a population of obscured "type 2" quasars should also exist. High angular resolution observations suggest that the torus in NGC 1068 is larger than predicted in our geometrically simple models. We suggest a modification of this geometry which is consistent with all the data. We explain the 1" - 2" extended IR emission in NGC 1068 partly by radiation from the torus which is reflected by electron scattering, and partly by dust in the narrow line region. Subject headings: dust, extinction - galaxies: active - galaxies: nuclei - galaxies: Seyfert - infrared: galaxies
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