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Date and Time of the Query: 2019-06-15 T14:53:24 PDT
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For refcode 1997ApJ...486..132B:
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1997ApJ...486..132B Optical and Far-Infrared Emission of IRAS Seyfert Galaxies CHARLES J. BONATTO AND MIRIANI G. PASTORIZA Departamento de Astronomia, Instituto de Fisica, Universidade Federal do Rio Grande do Sul, C.P. 15051, CEP 91501-970, Porto Alegre, Rio Grande do Sul, Brazil Received 1997 January 8; accepted 1997 April 3 ABSTRACT 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 (L_IR_/L_sun_) <= 12.6. We show that both types of Seyferts have approximately the same distribution of number of objects with a given L_IR_. 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 indistinguishable from each other. From the luminosity ratios L_IR_/L_H_{alpha} and L_IR_/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. Subject headings: dust, extinction-galaxies: photometry-galaxies: Seyfert-infrared: galaxies
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