The outer disks of galaxies: "To be or not to be truncated?"

Details The outer disks of galaxies: "To be or not to be truncated?" The outer disks of galaxies: "To be or not to be truncated?"

2005-09-02

arxiv.org/abs/astro-ph/0509057v1

Astronomy and Astrophysics

Astrophysics

LaTeX, 6 pages. To appear in the proceedings of the "Island Universes: Structure and Evolution of Disk Galaxies" conference he

Scientific paper

We have in recent years come to view the outer parts of galaxies as having vital clues about their formation and evolution. Here, we would like to briefly present our results from a complete sample of nearby, late-type, spiral galaxies, using data from the SDSS survey, especially focused on the stellar light distribution in the outer disk. Our study shows that only the minority of late-type galaxies show a classical, exponential Freeman Type I profile down to the noise limit, whereas the majority exhibit either downbending (stellar truncation as introduced 1979 by Piet van der Kruit) or upbending profiles.

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