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Astron. Astrophys. 331, L9-L12 (1998)

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Letter to the Editor

ISOPHOT boosts dust masses in spiral galaxies *

E. Krügel 1, R. Siebenmorgen 2, V. Zota 1 and R. Chini 3

1 MPIfR, Auf dem Hügel 69, D-53121 Bonn, Germany
2 ISO Science Operations Centre, Astrophysics Division of ESA, Villafranca del Castillo, P.O. Box 50727, E-28080 Madrid, Spain
3 Astronomisches Institut der Ruhr-Universität Bochum, Universitätsstr. 150 NA7, D-44780 Bochum, Germany

Received 5 September 1997 / Accepted 6 November 1997

Abstract

We report photometry with ISO between 60 and 200µm of six galaxies. Three of them are active and the extension of their spectra beyond the IRAS bands up to 200µm confirms our previous conception that most of the dust there is warm and has a fairly uniform temperature of [FORMULA] 30 K. In the other three galaxies which are inactive, we detect a very cold component ([FORMULA] 10 K and less) that could hitherto at best be surmised. The most dramatic consequence is a threefold increase in the mass of interstellar material over what one would calculate without the ISO data.

Key words: galaxies: interstellar matter – galaxies: dust

* 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) with the participation of ISAS and NASA.

Send offprint requests to: E. Krügel

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© European Southern Observatory (ESO) 1998

Online publication: February 16, 1998
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