Back to the Abstract

Article Contents
1 Introduction
2 The galaxy sample
3 Observations and photometric results
4 Nature of the mid-infrared emitting species
5 The dependence of $\vec{F_{\mathsf {15}}/F_{\mathsf 7}}$ on spiral and bar types and comparison with IRAS results
6 The role of central regions
7 Origin of the circumnuclear infrared excess
8 Summary and conclusions

Copyright ESO 2001
Published by EDP Sciences