Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-10-31
Mon.Not.Roy.Astron.Soc.373:1379-1388,2006
Astronomy and Astrophysics
Astrophysics
11 pages, 12 figures, accepted by MNRAS
Scientific paper
10.1111/j.1365-2966.2006.11164.x
Cold clouds embedded in warm media are very common objects in astrophysics. Their disruption timescale depends strongly on the dynamical configuration. We discuss the evolution of an initially homogeneous cold cloud embedded in warm turbulent gas. Within a couple of dynamical timescales, the filling factor of the cold gas within the original cloud radius drops below 50%. Turbulent diffusivities estimated from the time evolution of radial filling factor profiles are not constant with time. Cold and warm gas are bodily transported by turbulence and mixed. This is only mildly indicated by column density maps. The radiation field within the cloud, however, increases by several orders of magnitudes due to the mixing, with possible consequences for cloud chemistry and evolution within a few dynamical timescales.
Burkert Andreas
Devriendt Julien E. G.
Heitsch Fabian
Slyz Adrianne D.
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