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Astron. Astrophys. 348, 705-710 (1999)


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The 10-200 µm spectral energy distribution of the prototype narrow-line X-ray galaxy NGC 7582 *

M. Radovich 1, U. Klaas 1, J. Acosta-Pulido 2 and D. Lemke 1

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

Received 16 March 1999 / Accepted 7 June 1999

Abstract

We present the spectral energy distribution (SED) between 10 and 200 µm obtained for the prototype narrow-line X-ray galaxy NGC 7582 with ISOPHOT, the photometer on board the Infrared Space Observatory . The emission is spatially extended and we separated for the first time the nuclear and extranuclear infrared SEDs. The nuclear luminosity ([FORMULA] [FORMULA]) is dominated by cold ([FORMULA] 32 K) dust emission mainly due to star formation activity; warm ([FORMULA] 122 K) dust emission is also present and is probably related to the active nucleus. In addition to a cold component of 30 K, the extranuclear SED ([FORMULA] [FORMULA]) shows emission by colder ([FORMULA] 17 K) dust: this very cold component comprises 90% of the total dust mass of [FORMULA] [FORMULA].

Key words: galaxies: active – galaxies: Seyfert – galaxies: individual: NGC 7582

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

Send offprint requests to: M. Radovich (radovich@mpia-hd.mpg.de)

© European Southern Observatory (ESO) 1999

Online publication: August 13, 199

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