We discuss some results of a morphological study of edge-on galaxies, based on optical and especially near-infrared surface photometry. We find that the vertical surface brightness distributions of galaxies are fitted very well by exponential profiles, much better than by isothermal distributions. We find that in general the vertical scale height increases when going outward. This increase is strong for early-type spiral galaxies and very small for late types. We argue that it can be due to the presence of thick discs with scale lengths larger than the galaxy's main disc. Finally we discuss the colour-magnitude relation in I-K for spiral galaxies. We find that it is a tight relation, for which the scatter is similar to the observational uncertainties, with a steeper slope than for elliptical galaxies.
|Title of host publication||Extragalactic astronomy in the infrared = Astronomie extragalactique dans l'infrarouge|
|Subtitle of host publication||proceedings of the XVIIth Rencontres de Moriond, Les Arcs, France, March 15-22, 1997|
|Editors||G. A. Mamon, Trinh Xuân Thuân, J. Trân Thanh Vân|
|Place of Publication||Paris|
|Number of pages||10|
|Publication status||Published - 1997|