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25 April 2024

» arxiv » astro-ph/0010391

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Submillimeter Wave Astronomy Satellite Observations of Extended Water Emission in Orion
R. L. Snell ; J. E. Howe ; M. L. N. Ashby ; E. A. Bergin ; G. Chin ; N. R. Erickson ; P. F. Goldsmith ; M. Harwit ; S. C. Kleiner ; D. G. Koch ; D. A. Neufeld ; B. M. Patten ; R. Plume ; R. Schieder ; J. R. Stauffer ; V. Tolls ; Z. Wang ; G. Winnewisser ; Y. F. Zhang ; G. J. Melnick ;
Date:	19 Oct 2000
Journal:	ApJ (Letters), 539, L93 (2000)
Subject:	astro-ph
Abstract:	We have used the Submillimeter Wave Astronomy Satellite to map the ground-state 1_{10}-1_{01} transition of ortho-water at 557 GHz in the Orion molecular cloud. Water emission was detected in Orion over an angular extent of about 20 arcmin, 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-water abundance relative to H_2 in the extended gas in Orion varies between 1 and 8x10^{-8}, with an average of 3x10^{-8}. The absence of detectable narrow-line ortho-H_2^{18}O emission is used to set a 3-sigma upper limit on the relative ortho-water abundance of 7x10^{-8}.
Source:	arXiv, astro-ph/0010391
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