Stellar distributions and NIR colours of normal galaxies

Reynier F. Peletier, Richard de Grijs

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

Abstract

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.
Original languageEnglish
Title of host publicationExtragalactic astronomy in the infrared = Astronomie extragalactique dans l'infrarouge
Subtitle of host publicationproceedings of the XVIIth Rencontres de Moriond, Les Arcs, France, March 15-22, 1997
EditorsG. A. Mamon, Trinh Xuân Thuân, J. Trân Thanh Vân
Place of PublicationParis
PublisherEditions Frontieres
Number of pages10
ISBN (Print)9782863322260
Publication statusPublished - 1997
Externally publishedYes

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