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Observations of Winds, Jets, and Turbulence Generation in GMCs

Published online by Cambridge University Press:  27 April 2011

John Bally
John Bally*
Affiliation:
Astrophysical and Planetary Sciences Department, Center for Astrophysics and Space Astronomy, UBC 389, University of Colorado at Boulder, Boulder CO 80309, USA email: [email protected]
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Abstract

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Protostellar outflows can inject sufficient mass, momentum, and kinetic energy into their parent star-forming clumps to dramatically alter their structure, generate turbulence, and even to disrupt them. Outflows represent the lowest rung on a ‘feedback ladder’ consisting of increasingly powerful mechanisms which kick-in if star formation escalates towards the production of more massive stars, higher efficiency, and larger clusters. Outflow feedback may dominate turbulence generation and cloud disruption on the scale of cluster-forming clumps having dimensions up to a few parsecs. Outflows inject energy and momentum on a wide-range of length-scales from less than 0.01 pc to over 30 pc. However, they fail by several orders of magnitude to inject sufficient momentum and kinetic energy to drive turbulent motions on the size and mass-scales of GMCs. Injection from higher rungs on the feedback ladder or momentum injected by Galactic-scale processes are needed to power the observed turbulence on the 10 to 100 pc scales of GMCs.

Keywords

stars: formationISM: jets and outflowsISM: Herbig-Haro objects
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S270: Computational Star Formation , May 2010 , pp. 247 - 254
Copyright
Copyright © International Astronomical Union 2011

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