Evidence for interstellar H2O in the Orion molecular cloud

Details Evidence for interstellar H2O in the Orion molecular cloud Evidence for interstellar H2O in the Orion molecular cloud

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...335l..27k&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 335, Dec. 1, 1988, p. L27-L30.

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17

Astronomical Spectroscopy, Interstellar Chemistry, Interstellar Gas, Molecular Clouds, Orion Nebula, Water, Absorption Spectra, Abundance, Carbon Monoxide, Infrared Spectra, Red Shift

Scientific paper

A search for interstellar gas phase H2O in the infrared spectrum of the BN object in Orion is reported. There is absorption (S/N = 2-4) at the position of the nu3 1(01)-2(02) line of H2O at 3801.42/cm, the strongest expected H2O line. Statistical analysis of the spectrum provides corroborating evidence for other H2O lines. With an assumed H2O excitation temperature of 150 K, N(H2O) of 2.3 x 10 to the 17th/sq cm or less toward the BN object is derived. The H2O column density implies abundance ratios of (H2O)/(CO) = 0.01-0.08 or less and (HDO)/(H2O) = 0.8-3.0 x 10 to the -3rd or more. The gas-to-ice ratio is (H2O gas)/(H2O ice) = 0.06 with an estimated uncertainty of a factor of 5.

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