|
1 Introduction
|
|
|
2 The galaxy sample
|
|
|
3 Observations and photometric results
|
|
|
4 Nature of the mid-infrared emitting species
|
|
|
5 The dependence of
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
|
|
|
References
|
