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Astron. Astrophys. 315, L129-L132 (1996)

Bimodal dust emission in three classical Seyfert galaxies: NGC 3227, NGC 4051 and NGC 4151*

J.M. Rodríguez Espinosa1, A.M. Pérez García1, D. Lemke2, and K. Meisenheimer2

1 Instituto de Astrofísica de Canarias, E-38200 La Laguna (Tenerife), Spain
2 Max Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany

Received 24 July 1996 / Accepted 23 August 1996

Abstract. Far Infrared observations of the Seyfert galaxies NGC 3227, NGC 4051 and NGC 4151 are presented. These are the first data from a complete sample of Seyfert galaxies that is being observed by ISO as part of the ISOPHOT guaranteed time. The new ISO data, in combination with the IRAS data, show that the mid to far IR emission in all three objects can be ascribed to two well defined regimes, namely a warm dust emitting region which we claim is heated by the emission from the respective active nuclei and a second colder emitting region which we attribute to dust heated in star forming regions.

Key words: galaxies: individual (NGC 3227, NGC 4051, NGC 4151) - galaxies: spectral energy distribution - galaxies: Seyfert - galaxies: photometry

* Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with the participation of ISAS and NASA.

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