Kolmogorov-Burgers Model for Turbulence in Molecular Clouds

Details Kolmogorov-Burgers Model for Turbulence in Molecular Clouds Kolmogorov-Burgers Model for Turbulence in Molecular Clouds

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19914902b&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #149.02; Bulletin of the American Astronomical Society, Vol. 33, p.1528

Astronomy and Astrophysics

Astronomy

Scientific paper

The process of star formation in interstellar molecular clouds is believed to be controlled by driven supersonic magnetohydrodynamic turbulence. We suggest that in the inertial range such turbulence obeys the Kolmogorov law, while in the dissipative range it behaves as Burgers turbulence developing shock singularities. On the base of the She--Leveque analytical model we then predict the velocity power spectrum in the inertial range to be Ek~k-1.74. This result reproduces the observational Larson law, < u2_l > ~ l0.74\cdots0.76, [Larson, MNRAS 194 (1981) 809] and agrees well with recent numerical findings by Padoan and Nordlund [astro-ph/0011465]. The application of the model to more general dissipative structures, with higher fractal dimensionality, leads to better agreement with recent observational results.

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