Non-LTE line formation in clumpy and turbulent molecular clouds

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Line: Formation, Radiative Transfer, Ism: Clouds, Ism: Molecules, Radio Lines: Ism

Scientific paper

Extending previous work (Albrecht & Kegel \cite{alb87}, Kegel et al. \cite{keg93}, Piehler & Kegel \cite{pie94}), we investigated the formation of interstellar molecular lines in a medium with stochastic density and velocity fluctuations. We solved the full NLTE-problem, i.e. the generalized radiative transfer equation simultaneously with the rate equations, for a 6-level CO molecule and a plane-parallel slab geometry. Our results indicate that accounting for a finite correlation length of both, the density and velocity field, strongly affects the line profile and the line width as well as the intensity ratios of different rotational transitions.

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