Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-07-08
Astronomy and Astrophysics
Astrophysics
7 pages, latex, with figures, submitted to MNRAS, also at http://www.mpa-garching.mpg.de/~syer/papers
Scientific paper
We use data from the literature to constrain theoretical models of galaxy formation. We show how to calculate the dimensionless spin parameter $\lambda$ of the halos of disk galaxies and we compare the distribution of $\lambda$ with that observed in cosmological $N$-body simulations. The agreement is excellent, which provides strong support for the hierarchical picture of galaxy formation. Assuming only that the radial surface density distribution of disks is exponential, we estimate crudely the maximum-disk mass-to-light ratio in the $I$-band and obtain $
Mao Shude
Mo Hou-Jun
Syer Dave
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