Other
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.1504v&link_type=abstract
American Astronomical Society, 189th AAS Meeting, #15.04; Bulletin of the American Astronomical Society, Vol. 28, p.1293
Other
Scientific paper
We present two-dimensional numerical simulations of an isothermal turbulent gas undergoing gravitational collapse, aimed at testing for the presence of ``logatropic'' behavior, as indicated by the evolution of the turbulent velocity dispersion as the density increases during the collapse. A logatropic behavior would require that Delta v ~ rho (-1/2) , which, however, is not verified in the simulations. Instead, the velocity dispersion increases with the density, in a process reminiscent of the temperature increase upon compression of an ideal gas, although in the present case the change in the ``internal energy'' of the turbulent gas is due to an increase of both the density and the speed of the fluid parcels. We thus suggest that the logatropic ``equation of state'' represents only the statistically most probable state of an ensemble of virialized clouds, but does not adequately represent the behavior of the ``turbulent pressure'' within a single cloud undergoing a thermodynamic process.
Cantó Jorge
Lizano Susana
Vázquez-Semadeni Enrique
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