Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-19
Astrophys.J.638:L13-L16,2006
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures. Minor changes. Accepted on ApJL
Scientific paper
10.1086/500556
We compute the angular momentum, the spin parameter and the related distribution function for Dark Matter halos hosting a spiral galaxy. We base on scaling laws, inferred from observations, that link the properties of the galaxy to those of the host halo; we further assume that the Dark Matter has the same total specific angular momentum of the baryons. Our main results are: (i) we find that the gas component of the disk significantly contributes to the total angular momentum of the system; (ii) by adopting for the Dark Matter the observationally supported Burkert profile, we compute the total angular momentum of the disk and its correlation with the rotation velocity; (iii) we find that the distribution function of the spin parameter $\lambda$ peaks at a value of about 0.03, consistent with a no-major-merger scenario for the late evolution of spiral galaxies.
Lapi Andrea
Salucci Paolo
Shankar Francesco
Tonini Chiara
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