EDP Sciences
Free access
Volume 377, Number 1, October I 2001
Page(s) 60 - 65
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20011091

A&A 377, 60-65 (2001)
DOI: 10.1051/0004-6361:20011091

Research Note

On the relation between the IR continuum and the active galactic nucleus in Seyfert galaxies

M. A. Prieto1, 2, A. M. Pérez García2 and J. M. Rodríguez Espinosa2

1  European Southern Observatory, 85748 Garching, Germany
2  Instituto de Astrofísica de Canarias, 38200 La Laguna (Tenerife), Spain

(Received 15 November 2000 / Accepted 26 July 2001 )

A sample of the brightest known Seyfert galaxies from the CfA sample is analyzed on the basis of ISO photometric and spectroscopic data. Regardless of the Seyfert type, the mid-IR continuum emission from these galaxies is found to be correlated with the coronal line emission arising in the nuclear active region. Conversely, the correlation degrades progressively when moving from the mid- to the far-IR emission, where it vanishes. It is concluded that the mid-IR emission is largely dominated by dust heated by processes associated with the active nucleus whereas the far-IR is a different component most probably unrelated with the active region. We suggest that the far-IR component is due to dust heated by the stellar population in the disks of these galaxies.

Key words: galaxies: Seyfert -- infrared: galaxies

Offprint request: A. M. Pérez García, apg@ll.iac.es

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