Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...182..299h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 182, no. 2, Aug. 1987, p. 299-304.
Astronomy and Astrophysics
Astrophysics
38
Heavy Water, Interstellar Matter, Molecular Clouds, Orion Nebula, Abundance, Grains, Line Spectra, Molecular Spectra, Optical Thickness
Scientific paper
The first detections of the 321-414 and 532-533 lines of HDO are reported: both lines are observed in emission toward Orion-KL with velocities typical of the "Hot Core" and the "Compact Ridge", while the 321-414 line is seen in absorption toward NGC 7538-IRS1. The presence of highly excited HDO in these two sources suggests that the observed lines form in a hot and dense molecular environment, where the kinetic temperature exceeds 100K. The Orion data are combined with other line results to derive optical depths, excitation temperature, column densities, and relative abundance. An upper limit to the [HDO]/[H2O] ratio is given which is inconsistent with gas phase ion-molecule or gas phase shock formation schemes. It is suggested that large amounts of HDO are released from grain mantles when the kinetic temperature exceeds 100K. The data from NGC 7538 are used to obtain a direct estimate of the optical depth, which indicates deviations from thermal equilibrium.
Henkel Carsten
Mauersberger Rainer
Menten Karl. M.
Snyder Lewis E.
Wilson Thomas L.
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