Scaling Laws in Self-Gravitating Disks

Details Scaling Laws in Self-Gravitating Disks Scaling Laws in Self-Gravitating Disks

1999-04-16

arxiv.org/abs/astro-ph/9904209v1

Astrophys.Space Sci. 276 (2001) 523-530

Astronomy and Astrophysics

Astrophysics

9 pages, 6 figures. To be published in the proceedings of The Evolution of Galaxies on Cosmological Timescale, eds. J.E. Beckm

Scientific paper

10.1023/A:1017532808950

The interstellar medium (ISM) reveals strongly inhomogeneous structures at every scale. These structures do not seem completely random since they obey certain power laws. Larson's law (\citeyear{Larson81}) $\sigma \propto R^{\delta}$ and the plausible assumption of virial equilibrium justify to consider fractals as a possible description of the ISM. In the following we investigate how self-gravitation, differential rotation and dissipation affect the matter distribution in galaxies. To this end we have performed 3D-simulations for self-gravitating local boxes embedded in a larger disk, extending the 2D-method of Toomre & Kalnajs (\citeyear{Toomre91}) and Wisdom & Tremaine (\citeyear{Wisdom88}). Our simulations lead to the conclusion that gravitation, shearing and dissipation can be dominantly responsible for maintaining an inhomogeneous and eventually a fractal distribution of the matter.

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