Massive Stars Dominate the Support of Giant Molecular Clouds

Details Massive Stars Dominate the Support of Giant Molecular Clouds Massive Stars Dominate the Support of Giant Molecular Clouds

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.9602m&link_type=abstract

American Astronomical Society, 198th AAS Meeting, #96.02; Bulletin of the American Astronomical Society, Vol. 33, p.1183

Astronomy and Astrophysics

Astronomy

2

Scientific paper

Giant molecular clouds are supported against collapse by turbulent motions that dissipate very rapidly. Yet, clouds form stars slowly and are disrupted by HII regions before a significant mass becomes stellar. We show that these HII regions, not protostellar outflows, are the dominant source of momentum for cloud turbulence. A balance between turbulent dissipation and regeneration implies cloud lifetimes that, within uncertainties, are compatible with observations.

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