Codella, C.;
Viti, S.;
Williams, D.A.;
Bachiller, R.;
(2006)
First evidence for molecular interfaces between outflows and ambient clouds in high-mass star-forming regions?
The Astrophysical Journal
, 644
(1)
L41-L44.
10.1086/505426.
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Abstract
We present new observations of the Cep A East region of massive star formation and describe an extended and dynamically distinct feature not previously recognized. This feature is present in emission from H2CS, OCS, CH3OH, and HDO at −5.5 km s−1 but is not traced by the conventional tracers of star-forming regions, H2S, SO2, SO, and CS. The feature is extended up to at least 0.1 pc. We show that the feature is neither a hot core nor a shocked outflow. However, the chemistry of the feature is consistent with predictions from a model of an eroding interface between a fast wind and a dense core; mixing between the two media occurs in the interface on a timescale of 10–50 yr. If these observations are confirmed by detailed maps and by detections in species also predicted to be abundant (e.g., HCO+, H2CO, and NH3), this feature would be the first detection of such an interface in regions of massive star formation. An important implication of the model is that a significant reservoir of sulfur in grain mantles is required to be in the form of OCS.
| Type: | Article |
|---|---|
| Title: | First evidence for molecular interfaces between outflows and ambient clouds in high-mass star-forming regions? |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1086/505426 |
| Publisher version: | http://dx.doi.org/10.1086/505426 |
| Language: | English |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10142 |
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