On the generation and maintenance of turbulence in the interstellar medium

Details On the generation and maintenance of turbulence in the interstellar medium On the generation and maintenance of turbulence in the interstellar medium

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246l.151f&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 246, June 15, 1981, p. L151-L154. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

84

Galactic Rotation, Interstellar Matter, S Waves, Turbulent Flow, Vortices, Eddy Viscosity, Flow Characteristics, Kolmogoroff Theory, Steady State

Scientific paper

The broad spectrum of turbulent motions observed in the interstellar medium may be produced by the shearing action of differential galactic rotation. A steady state eddy distribution is maintained as energy cascades down the eddy hierarchy to smaller-scale motions. The characteristic decay time for interstellar turbulence is found to be 50-billion yr. Objections frequently raised against the presence of long-lived turbulent motions in the interstellar medium are therefore invalid, since these arguments usually presuppose that there is no source of fresh turbulent energy.

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