Observations and analysis of HDO in interstellar clouds

Details Observations and analysis of HDO in interstellar clouds Observations and analysis of HDO in interstellar clouds

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...306..682m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 306, July 15, 1986, p. 682-690.

Astronomy and Astrophysics

Astronomy

27

Heavy Water, Interstellar Chemistry, Interstellar Matter, Orion Nebula, Radio Astronomy, Brightness Temperature, Energy Levels, Molecular Excitation, Radio Spectra, Reaction Kinetics

Scientific paper

Emission from the 1(10)-1(11) transition of HDO at 80 GHz and from 2(11)-2(12) transition at 241 GHz in the KL region of Orion was mapped. The emission originates in a 20-25 arcsec source in the molecular ridge and in a 15 arcsec source in the hot core. Numerical analysis of the excitation shows that the strong emission in both transitions is a result of the high molecular hydrogen density. The fractional abundance of HDO is less than 3 x 10 to the -10th in the hot core and 5-60 x 10 to the -10th in the ridge. A chemical model predicts an H2O fractional abundance of 10 to the -5th to 10 to the -4th in the ridge and less than 2 x 10 to the -5th in the hot core, which is consistent with gas-phase models. A nondetection of the 3(21)-3(22) transition at 50 GHz in Orion and of the 1(10)-1(11) transition in 13 other sources is reported.

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