Collisions between high-latitude clouds - Theory meets observations

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Carbon Monoxide, Hydrodynamics, Interstellar Matter, Molecular Clouds, Radiative Transfer, Gravitational Collapse, Interstellar Chemistry, Star Formation, Velocity Distribution

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A three-dimensional model for hydrodynamic and radiative transfer simulations of collisions between high-latitude clouds is described. The smooth particle hydrodynamics code by Lattanzio and Henriksen (1988) is used to compute the velocity and density fields in the impacted clouds along with a recently developed radiative transfer code to compute (C-13)O line radiation from the simulated source. The model shows the following: the so far unexplained energy source for the broad CO line wings reported by Blitz, Magnani, and Wandel (1987) derives from the collisions; collisions can induce rapid gravitational collapse and star formation in these clouds which are otherwise supported against gravitational contraction via their internal energy content; and the external pressure due to intercloud H I, first proposed by Keto and Myers (1986), plays a significant role in the stability and evolution of the high-latitude clouds.

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