Fragmentation in Kinematically Cold Disks

Astronomy and Astrophysics – Astrophysics

Scientific paper

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4 pages, 4 figures. To be published in the proceedings of "The Promise of FIRST" symposium, eds. G.L. Pilbratt, J. Cernicharo,

Scientific paper

Gravity is scale free. Thus gravity may form similar structures in self-gravitating systems on different scales. Indeed, observations of the interstellar medium, spiral disks and cosmic structures, reveal similar characteristics. The structures in these systems are very lumpy and inhomogeneous. Moreover some of these structures do not seem to be of random nature, but obey certain power laws. Models of slightly dissipative self-gravitating disks show how such inhomogeneous structures can be maintained on the kpc-scale. The basic physical processes in these models are self-gravity, dissipation and differential rotation. In order to explore the structures resulting from these processes, local simulations of self-gravitating disks are performed in 2D and 3D. We observe persistent patterns, formed by transient structures, whose intensity and morphological characteristic depend on the dissipation rate.

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