A Mid-Infrared Test of the ``Obscuring Torus'' Model for Seyfert Nuclei

Details A Mid-Infrared Test of the ``Obscuring Torus'' Model for Seyfert Nuclei A Mid-Infrared Test of the ``Obscuring Torus'' Model for Seyfert Nuclei

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...446..101h&link_type=abstract

Astrophysical Journal v.446, p.101

Astronomy and Astrophysics

Astronomy

32

Galaxies: Seyfert, Infrared: Galaxies

Scientific paper

Ground-based small-aperture measurements of the nuclear and mid-infrared emission (in the N band at 10.6 μm) are considered for a large but heterogeneous sample of Seyfert galaxies, and also for three smaller but homogeneous samples (one far-infrared-selected, one mid-infrared-selected, and one optically selected). For all these samples, the average ratio of 10.6 microns to nonthermal radio continuum (1.4 GHz) flux densities is ˜4 times larger in the type 1 Seyferts than in the type 2 Seyferts (at high levels of statistical significance). Also, the average ratio of the 10.6 microns flux density to the [O III] λ5007 emission-line flux is about twice as large in type 1 Seyferts compared to type 2 Seyferts, although this difference is of high statistical significance only in the large heterogeneous sample. These results are similar to the differences in the mid-infrared between the quasars and broad-line radio galaxies compared to the narrow-line radio galaxies in the 3CR catalog. All these results are in satisfactory agreement with the predictions for mildly anisotropic thermal mid-infrared emission from the optically thick "obscuring torus" that is hypothesized to be responsible for hiding the type 1 Seyfert nucleus (quasar) from our direct view in type 2 Seyfert galaxies (narrow-line radio galaxies).

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