Hypersonic Swizzle Sticks: Protostellar Turbulence, Outflows and Fossil Outflow Cavities |
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| Authors: | A Frank |
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| Institution: | (1) Department of Physics and Astronomy and Laboratory for Laser Energetics, University of Rochester, Rochester, NY 14627–0171, USA |
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| Abstract: | The expected lifetimes for molecular clouds has become a topic of considerable debate as numerical simulations have shown
that MHD turbulence, the nominal means of support for clouds against self-gravity, will decay on short timescales. Thus it
appears that either molecular clouds are transient features or they are resupplied with turbulent energy through some means.
Jets and molecular outflows are recognized as a ubiquitous phenomena associated with star formation. Stars however form not
isolation but in clusters of different density and composion. The ubiquity and high density of outflows from young stars in
clusters make them an intriguing candidate for the source of turbulence energy in molecular clouds. In this contribution we
present new studies, both observational and theoretical, which address the issue of jet/outflow interactions and their abilityto
drive turbulent flows in molecular clouds. Our studies focus on scales associated with young star forming clusters. In particular
we first show that direct collisions between active outflows are not effective at stirring the ambient medium. We then show
that fossil cavities from “extinct” outflows may provide the missing link in terms of transferring momentum and energy to
the cloud. |
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| Keywords: | Hydrodynamics Methods: Laboratory ISM: Herbig-Haro objects Stars: Winds Outflows |
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