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2005MNRAS.361..244C - Mon. Not. R. Astron. Soc., 361, 244-258 (2005/July-3)
Chemical differentiation along the CepA-East outflows.
CODELLA C., BACHILLER R., BENEDETTINI M., CASELLI P., VITI S. and WAKELAM V.
Abstract (from CDS):
The analysis of the line profiles shows that the SiO molecule dominates at the highest velocities and at the highest excitation conditions, confirming its close association with shocks. H2S, SO2and SO preferentially trace more quiescent regions than SiO, and, in particular, a lack of bright H2S emission at the highest velocities is found. OCS and H2CS emit at quite high velocities, where the abundances of three shock tracers such as SiO, CH3OH and HDO are higher. These results may indicate that H2S is not the only major sulphur carrier in the grain mantles, and that OCS and H2CS may probably play an important role on the grains, or that alternatively they rapidly form once the mantle is evaporated after the passage of a shock. Finally, the outflow peak emission has been compared with recent time-dependent sulphur chemistry models: the results indicate that, if associated with accurate measurements of the physical conditions, the CH3OH/H2CS column density ratio can be used as an effective chemical clock to date the age of shocked gas.
Abstract Copyright: 2005 RAS
Journal keyword(s): ISM: clouds - ISM: individual: CepA - ISM: jets and outflows - ISM: molecules - radio lines: ISM
Simbad objects: 6
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