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Astron. Astrophys. 350, 765-776 (1999)

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ISOPHOT observations of narrow line Seyfert 1 galaxies

M. Polletta 1,2 and T.J.-L. Courvoisier 1,2

1 Geneva Observatory, Ch. des Maillettes 11, 1290 Sauverny, Switzerland
2 Integral Science Data Centre, Ch. d'Ecogia 16, 1290 Versoix, Switzerland

Received 31 March 1999 / Accepted 6 September 1999


Broad infrared spectra (7-200 µm) of four NLSy1 galaxies, obtained with the imaging photo-polarimeter (ISOPHOT) on-board ISO, are presented. ISOPHOT data have been analyzed applying a (non standard) method that is described in details.

The infrared spectra of the four selected NLSy1 galaxies have been analyzed in order to derive the distribution of luminosities, temperatures, opacities and sizes of the emitting dust. A comparison between infrared ([FORMULA]) and optical emission line ([FORMULA] and [FORMULA]) properties suggests that NLSy1 galaxies suffer different degrees of dust absorption according to the inclination of the line of sight.

Key words: galaxies: individual: – galaxies: photometry – galaxies: Seyfert – infrared: galaxies

Send offprint requests to: Maria.Polletta@obs.unige.ch

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© European Southern Observatory (ESO) 1999

Online publication: October 14, 1999