Hydrodynamic and turbulent motions in the galactic disk

Details Hydrodynamic and turbulent motions in the galactic disk Hydrodynamic and turbulent motions in the galactic disk

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..93...37q&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 93, no. 1, June 1983, p. 37-54.

Astronomy and Astrophysics

Astrophysics

18

Galactic Structure, Hydrodynamics, Hydrogen Clouds, Interstellar Matter, Isotropic Turbulence, Kolmogoroff Theory, Density Distribution, Galactic Rotation, Gravitational Collapse, Molecular Clouds, Spiral Galaxies

Scientific paper

The purpose of the paper is to study hierarchy of motions and its relation with the galactic structure using the available observational data in the 21-cm line. Adequated statistics in absorption 21 cm data show two types of components in the cool clouds; a narrow one associated to dense clouds with molecular cores, and a wide one associated to low density features which can be considered as the largest eddies of a Kolmogorov spectrum or as the minimum features which one can see associated to the wave densities of the spiral structure. The author analyzes the relation between these components and the Kolmogorov law of turbulence, the relation with hydrodynamic motions and the tensorial form for these motions according to the Helmholtz theorem. There is also seen a classification of the hydrodynamic motions in the Galaxy according their scale-sizes. Concerning the turbulent part of the motions conditions for gravitational collapse of the clouds and the influence of the magnetic field are discussed.

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