Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-05
Astrophys.J. 644 (2006) L41-L44
Astronomy and Astrophysics
Astrophysics
Accepted for publication in The Astrophysical Journals Letters (8 pages, 3 figures)
Scientific paper
10.1086/505426
We present new observations of the CepA-East region of massive star formation and describe an extended and dynamically distinct feature not previously recognised. This feature is present in emission from H2CS, OCS, CH3OH, and HDO at -5.5 km/s, but is not traced by conventional tracers of star forming regions H2S, SO2, SO, 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 of 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 years. 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.
Bachiller Rafael
Codella Claudio
Viti Serena
Williams David. A.
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