Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...228..447j&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 228, no. 2, Feb. 1990, p. 447-470.
Astronomy and Astrophysics
Astrophysics
102
Ammonia, Deuterium Compounds, Heavy Water, Interstellar Chemistry, Molecular Clouds, Abundance, Molecular Spectra, Rotational Spectra
Scientific paper
A sample of galactic sources in the transitions of HDO and NH2D is surveyed by three different telescopes. The radiotelescopes involved in the experiment are described, and experimental HDO, H2(18)O, NH2D, and nondetection sets of data are analyzed. Focus is placed on estimates of HDO column densities and excitation temperatures, HDO absorption toward NGC 7538-IRS1, and estimates of the HDO/H2O abundance ratio and NH2D abundance. A Sgr B2 detection observed is considered to be the first clear evidence of the presence of deuterated molecules in a source close to the presence of deuterated molecules in a source close to the galactic center. It is noted that an analysis of the available Orion HDO data suggest that the HDO excitation is controlled by the far infrared field. The 3(13)-2(20) transition of H2(18)O toward several sources is also observed, and it is reported that models involving evaporation of dust grain mantles present the most promising way of explaining the molecular abundance data for galactic hot regions.
Baudry Alain
Henkel Carsten
Jacq Thierry
Jewell Phil R.
Mauersberger Rainer
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