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Submillimeter Wave Astronomy Satellite Observations Of Extended Water Emission In Orion, Ronald L. Snell, Je Howe, Mln Ashby, Ea Bergin, G Chin, Nr Erickson, Pf Goldsmith, M Harwit, Sc Kleiner, Dg Koch, Da Neufeld, Bm Patten, R Plume, R Schieder, Jr Stauffer, V Tolls, Z Wang, G Winnewisser, Yf Zhang, Gj Melnick

Astronomy Department Faculty Publication Series

We have used the Submillimeter Wave Astronomy Satellite to map the ground-state 1₁₀ → 1₀₁ transition of ortho-H₂O at 557 GHz in the Orion molecular cloud. H₂O emission was detected in Orion over an angular extent of about 20', or nearly 3 pc. The water emission is relatively weak, with line widths (3-6 km s^-1) and V_LSR velocities (9-11 km s^-1) consistent with an origin in the cold gas of the molecular ridge. We find that the ortho-H₂O abundance relative to H₂ in the extended gas …