Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...405l..39b&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 405, no. 1, p. L39-L42.
Astronomy and Astrophysics
Astrophysics
16
Absorption Spectra, Deuterium, Interstellar Gas, Molecular Ions, Optical Transition, Rotational Spectra, Electron Transitions, Hydronium Ions, Laser Spectrometers, Line Spectra, Molecular Clouds, Stellar Composition, Vibrational Spectra
Scientific paper
A search was made for the 1370 GHz lowest rotational transition of the molecular ion H2D+ in NGC 2264, W3, and the IRc2 region of M42. No emission lines were seen, but an absorption feature was detected toward IRc2. The column density and fractional abundance were calculated using a tentative identification of the line as the transition of para H2D+. The LSR velocity and the measured line width are consistent with the dynamical parameters of the hot core source. Physical parameters deduced from the data differ from those derived from millimeter-wave observations of the hot core condensation. It is suggested that significant amounts of low-density gas are associated with this region and that the material is cold enough for enhanced deuterium fractionation to occur. A search was also made for the 985 GHz transition of ortho H3O+ in W3 and IRc2 with negative results.
Betz Albert L.
Boreiko Rita T.
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