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Abstract
The SO2 molecule is detected in a large variety of objects, notably cold dark clouds and star-forming regions. An accurate modeling of the observations requires a very good knowledge of the collisional excitation rates with H2 due to competition between collisional and radiative processes that excite and quench the different rotational levels of the molecule. The results of our recent collisional calculations are summarized. Pierre was associated to all steps of this collaborative work that was a key project in the Molecular Universe European FP6 network.
Highlights
Sulfur dioxyde is a very abundant species in warm molecular clouds and is present in dark clouds.SO2 as well as SO and SiO is considered as a molecular tracer of shocks and as a consequence was identified as one of the milestones of the RTN-FP6 ”Molecular Universe” network
The new generation of receivers for ground based telescopes will permit to carry out sensitive line surveys in dark clouds in the centimeter and millimeter domains
All calculations presented below were performed with rigid molecules using the expansion of the 5D potential energy surface (PES) developed by Spielfiedel et al [3] where full details can be found
Summary
Sulfur dioxyde is a very abundant species in warm molecular clouds and is present in dark clouds. SO2 has many transitions in mm, submm, cm and far IR domains and may be observed with different ground-based telescopes as well as with the Herschel Space Observatory. The new generation of receivers for ground based telescopes will permit to carry out sensitive line surveys in dark clouds in the centimeter and millimeter domains. The knowledge of the collision rate coefficients allows one to define for each level j a critical density ncjrit such that:. The different steps and the results of this project are described the contribution of Pierre was decisive for several aspects
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