Astronomy and Astrophysics – Astronomy
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.2608b&link_type=abstract
American Astronomical Society, 196th AAS Meeting, #26.08; Bulletin of the American Astronomical Society, Vol. 32, p.711
Astronomy and Astrophysics
Astronomy
Scientific paper
We analyze dense clouds in 3D simulations of the ISM in which the turbulence is driven by supernova explosions. The simulations were done with a parallel Godunov method on an adaptive mesh. These clouds appear dense enough to form molecules on dynamical time scales. In the simulations, these molecular clouds are formed by the convergence of large scale streams on short timescales. These large scale motions are the result of the combined energy input by supernovae in the galactic disk. We find that the molecular clouds can be disrupted and dispersed rapidly, on time scales of a few Myr, shorter than what is usually assumed. In the dynamical timescale L/\Delta v, where L is the characteristic length of the cloud, the relevant velocity dispersion \Delta v$ is that of the external gas, which is responsible for the compression and formation of the cloud. Finally, we discuss scaling (Larson's) relations of the molecular clouds in the simulations.
Avillez Miguel
Ballesteros-Paredes Javier
Mac Low Mordecai-Mar
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