Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...486..132b&link_type=abstract
Astrophysical Journal v.486, p.132
Astronomy and Astrophysics
Astronomy
29
Ism: Dust, Extinction, Galaxies: Photometry, Galaxies: Seyfert, Infrared: Galaxies
Scientific paper
This paper presents an analysis of moderately large samples of type 1 and 2 Seyfert galaxies through optical observations and far-infrared IRAS data, also taking into account theoretical color indices derived from dust emission models. The galaxies in the samples cover a rather large interval in far-infrared luminosity, i.e., 7.6 <= log (LIR/L&sun;) <= 12.6. We show that both types of Seyferts have approximately the same distribution of number of objects with a given LIR. Galaxies with similar far-infrared color indices alpha (100, 60) are grouped together, and the corresponding average color indices are interpreted in terms of a simple model in which the observed colors result from the combination of dust directly heated by the active galactic nucleus with a component from the host galaxy represented by the emission of cool dust. On the basis of the average IRAS colors of the derived groups, we show that type 1 and 2 Seyfert galaxies are undistinguishable from each other. From the luminosity ratios LIR/LH alpha and LIR/L[O III], we show that basically the same model can be applied to both types of Seyfert, only allowing for the variation of model conditions: type 2 Seyferts would be like type 1 Seyferts but with the Seyfert nucleus and broad line region more effectively "hidden" by dust.
Bonatto Charles J.
Pastoriza Miriani Griselda
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