To be published in "The Spectral Energy Distribution of Gas-Rich Galaxies: Confronting Models with Data", Proceedings of the International Workshop held 4-8 October 2004 in Heidelberg, 4-8 Oct. 2004, Edited by Cristina C. Popescu and Richard J. Tuffs, AIP Conf. Ser.

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Abstract. Following on from IRAS, the ISOPHOT instrument on board the Infrared Space Observatory (ISO) has provided a huge advancement in our knowledge of the phenomenology of the far-infrared (FIR) emission of normal galaxies and the underlying physical processes. Highlights include: the discovery of an extended cold dust emission component, present in all types of gas-rich galaxies and carrying the bulk of the dust luminosity; the definitive characterisation of the spectral energy distribution in the FIR, revealing the channels through which stars power the FIR light; the derivation of realistic geometries for stars and dust from ISOPHOT imaging and the discovery of cold dust associated with HI extending beyond the optical body of galaxies.

Table of Contents

INTRODUCTION

SPIRAL GALAXIES

Spatial distributions

Integrated properties

Quantitative interpretation of FIR SEDs

DWARF GALAXIES

Cold dust surrounding dwarf galaxies

Infrared emission from within dwarf galaxies

CONCLUSIONS AND OUTLOOK

REFERENCES