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2002MNRAS.337..477P - Mon. Not. R. Astron. Soc., 337, 477-487 (2002/December-1)
Hydrodynamical simulations of the decay of high-speed molecular turbulence - I. Dense molecular regions.
PAVLOVSKI G., SMITH M.D., MAC LOW M.-M. and ROSEN A.
Abstract (from CDS):
After an initial phase of shock formation, power-law decay regimes are uncovered, as in the isothermal case. We find that the turbulence decays faster than in the isothermal case because the average Mach number remains higher, owing to the radiative cooling. The total thermal energy, initially raised by the introduction of turbulence, decays only a little more slowly than the kinetic energy.
We discover that molecule reformation, as the fast turbulence decays, is several times faster than that predicted for a non-turbulent medium. This is caused by moderate speed shocks which sweep through a large fraction of the volume, compressing the gas and dust. Through reformation, the molecular density and molecular column appear as complex patterns of filaments, clumps and some diffuse structure. In contrast, the molecular fraction has a wider distribution of highly distorted clumps and copious diffuse structure, so that density and molecular density are almost identically distributed during the reformation phase. We conclude that molecules form in swept-up clumps but effectively mix throughout via subsequent expansions and compressions.
Abstract Copyright: RAS
Journal keyword(s): hydrodynamics - molecular processes - shock waves - turbulence - ISM: clouds - ISM: kinematics and dynamics
Simbad objects: 1
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