Abstract
As a successful NASA explorer mission, SWAS makes first detections of the H2O emission at a ground-state transition (110 → 101). The general range of the fractional water abundance ([H2O] /[H2] ͠ 6×10-10 3 × 10-8), established through SWAS observations, are lower than those predicted by pure gas-phase chemistry by two orders of magnitude. SWAS does not detect O2 with one possible exception. The sensitive limits on O2 abundance, combined with measured H2O abundances, strongly suggest a critical role being played by dust grains in altering chemistry of relatively cold gas.
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Li, D., Melnick, G.J. (2003). Submillimeter Wave Astronomy Satellite and Star Formation. In: Cheng, K.S., Leung, K.C., Li, T.P. (eds) Stellar Astrophysics — A Tribute to Helmut A. Abt. Astrophysics and Space Science Library, vol 298. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0403-8_24
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DOI: https://doi.org/10.1007/978-94-017-0403-8_24
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