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Astron. Astrophys. 331, 651-660 (1998)

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Molecular gas phase counterparts to solid state grain mantles features: implication for gas/grain chemistry

E. Dartois 1, L. d'Hendecourt 1, F. Boulanger 1, M. Jourdain de Muizon 2, 3, M. Breitfellner 4, J.-L. Puget 1, and H. J. Habing. 5

1 IAS-CNRS, Université Paris XI, Batiment 121, F-91405 Orsay Cedex, France
2 DESPA, Observatoire de Paris, F-92190 Meudon, France
3 LAEFF-INTA, ESA Satellite tracking Station, P.O. Box 50727, E-28080 Madrid, Spain
4 ISO Science Operations, ESA/VILSPA Satellite Tracking Station, P.O. Box 50727, E-28080 Madrid, Spain
5 Leiden Observatory, P.O. Box 9513, 2300 RA Leiden, The Netherlands

Received 24 April 1997 / Accepted 20 August 1997


We present ISO SWS (AOT6) observations of the protostellar object RAFGL 7009S. This source is particularly interesting for the characterisation of chemistry arising from grain surfaces and mantles, since the solid state features of many simple molecules such as [FORMULA], CO, [FORMULA], [FORMULA] and [FORMULA] are detected, together with weaker features not yet unambiguously identified.

Gas phase [FORMULA], [FORMULA], [FORMULA] and CO can also be seen superimposed on the much broader solid state features. We derive an estimate for the gas phase temperature around 50K. The gas to solid ratios of these simple molecules is found to be [FORMULA] 0.2 for H2 O, [FORMULA] 0.2 for CH4, and an order of magnitude lower for CO2. We discuss the possible implications for interstellar chemistry in such objects.

Key words: ISM: RAFGL 7009S – ISM: molecules – dust, extinction – molecular processes – ISM: infrared: lines and bands

© European Southern Observatory (ESO) 1998

Online publication: February 16, 1998