Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-11-25
Mon.Not.Roy.Astron.Soc.368:351-360,2006
Astronomy and Astrophysics
Astrophysics
10 pages including 11 figures, Final version, MNRAS in press
Scientific paper
10.1111/j.1365-2966.2006.10115.x
We present a highly simplified model of the dynamical structure of a disk galaxy where only two parameters fully determine the solution, mass and angular momentum. We show through simple physical scalings that once the mass has been fixed, the angular momentum parameter $\lambda$ is expected to regulate such critical galactic disk properties as colour, thickness of the disk and disk to bulge ratio. It is hence expected to be the determinant physical ingredient resulting in a given Hubble type. A simple analytic estimate of $\lambda$ for an observed system is provided. An explicit comparison of the distribution of several galactic parameters against both Hubble type and $\lambda$ is performed using observed galaxies. Both such distributions exhibit highly similar characteristics for all galactic properties studied, suggesting $\lambda$ as a physically motivated classification parameter for disk galaxies.
Cervantes-Sodi Bernardo
Hernandez Xabier
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