IRAS and near-infrared observations of the Seyfert galaxies MCG 8-11-11, MKN 79 and MKN 279.
Roth, M.; Di Cocco, G.; Coe, M. J.; Spinoglio, L.; Bassani, L.; Dean, A. J.; Giovannelli, F.; Persi, P.; Tapia, M.; Sembay, S.; Ferrari-Toniolo, M.; MacDougall, J. R.; Elsmore, B.; Clement, R. M.
Italy, United Kingdom
Abstract
IRAS-pointed observations and near-infrared photometry of the Seyfert galaxies MCG 8-11-11, Mkn 79 and Mkn 279 are presented. Superimposed on a power law behaviour with α = -1.2, MCG 8-11-11 shows an excess at 25 μm which can be accounted for by black body emission at ≡200K from a dust emitting region of 73 pc or more. Mkn 79 has a single power law spectrum from 1 to 100 μm with α = -1.0. The spectrum of Mkn 279 from 12 to 100 μm can be fitted with a power law spectral index α = -1.44, breaking to a flatter spectrum at around 10 μm. Alternatively, the near-infrared data of this object can be interpreted in terms of a strong galactic component emerging over the underlying power law. The infrared observations are discussed and compared to measurements taken from the same objects at other wavelengths.