Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-02-23
Mon.Not.Roy.Astron.Soc. 350 (2004) 1029
Astronomy and Astrophysics
Astrophysics
11 pages, 5 figures, accepted by MNRAS; corrected label in figure 5
Scientific paper
10.1111/j.1365-2966.2004.07722.x
We investigate the origin of the small, chemically rich molecular clumps observed along the main axis of chemically rich outflows such as CB3 and L1157. We develop a chemical model where we explore the chemical evolution of these clumps, assuming they are partially pre-existing to the outflow, or alternatively newly formed by the impact of the outflow on the surrounding medium. The effects of the impact of the outflow are reproduced by density and temperature changes in the clump. We find that the observed abundances of CH3OH, SO and SO2 are best reproduced by assuming a scenario where the dense molecular gas observed is probably pre-existing in the interstellar medium before the formation of their exciting (proto)stars and that the clumpiness and the rich chemistry of the clumps are a consequence of a pre-existing density enhancement and of its interaction with the outflow.
Bachiller Rafael
Benedettini Milena
Codella Claudio
Viti Serena
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