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- W3036721662 abstract "We present preliminary numerical evidence that the physical conditions in high-mass star forming regions can arise from global gravitational infall, with the velocity dispersions being caused primarily by infall motions rather than random turbulence. To this end, we study the clumps and cores appearing in the region of central collapse in a numerical simulation of the formation, evolution, and subsequent collapse of a dense cloud out of a transonic compression in the diffuse atomic ISM. The clumps have sizes ∼ 1 pc, masses of several hundred M⊙, and three-dimensional velocity dispersions ∼ 3 km s , in agreement with typical observed values for such structures. The clumps break down into massive cores of sizes ∼ 0.1 pc, densities ∼ 10, masses 2-300 M⊙, with distributions of these quantities that peak at the same values as the massive core sample in a recent survey of the Cygnus X molecular cloud complex. Although preliminary, these results suggest that high-mass star forming clumps may be in a state of global gravitational collapse rather than in equilibrium supported by strong turbulence." @default.
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- W3036721662 date "2008-05-01" @default.
- W3036721662 modified "2023-10-16" @default.
- W3036721662 title "Massive Star-Forming Regions: Turbulent Support or Global Collapse?" @default.
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