Other
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.9605w&link_type=abstract
American Astronomical Society, 198th AAS Meeting, #96.05; Bulletin of the American Astronomical Society, Vol. 33, p.1183
Other
Scientific paper
Local coherent overdensities (clouds) covering a large range of scales and other properties are known to exhibit supersonic linewidths, with typical Mach numbers of at least a few, and sometimes much larger. We propose that this internal "turbulence" can be understood as the result of the action of impulsive intermittent injection of kinetic energy by passing shocks, cloud collisions, or magnetic waves, balanced by continuous internal turbulent dissipation inbetween the events. We formulate and solve a Chapmann-Kolmogorov kinetic equation for the distribution of cloud internal energies in this model. The observed linewidth pdfs for twelve regions or subregions of active star formation are presented and compared with the model results. We find that the model accounts for the existence of large internal velocity dispersions with non-Gaussian pdfs similar to observations, as well as the observed noisy relationship between line width and cloud size. We also discuss star formation and its regulation within the context of this model.
Miesch Mark S.
Scalo John
Williams Peter T.
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