A study of C3HD in cold interstellar clouds

The 1(10)-1(01) transition of C3HD was detected at 19.418 GHz at twelve positions in cold, dark clouds, and the D hyperfine components were resolved in two sources (L1498 and TMC-1C) well enough to derive values for the D quadrupole coupling constants. Simultaneous observations of C3H2 in each sourc...

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Veröffentlicht in:	The Astrophysical journal 1988-03, Vol.326 (2), p.924-930
Hauptverfasser:	Bell, M. B., Avery, L. W., Matthews, H. E., Feldman, P. A., Watson, J. K. G.
Format:	Artikel
Sprache:	eng
Schlagworte:	Astronomical Phenomena Astronomy Astrophysics Deuterium - analysis Deuterium - chemistry Earth, ocean, space Exact sciences and technology Extraterrestrial Environment Hydrocarbons - analysis Interstellar medium (ism) and nebulae in milky way Models, Theoretical Molecular clouds, h2 clouds, dense clouds, and dark clouds Space life sciences Spectrum Analysis Stellar systems. Galactic and extragalactic objects and systems. The universe
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Zusammenfassung:	The 1(10)-1(01) transition of C3HD was detected at 19.418 GHz at twelve positions in cold, dark clouds, and the D hyperfine components were resolved in two sources (L1498 and TMC-1C) well enough to derive values for the D quadrupole coupling constants. Simultaneous observations of C3H2 in each source yield relative integrated line intensities in the range 0.10-0.18, from which relative C3HD/C3H2 abundances in the range 0.05-0.15 were derived. These are among the highest deuteration ratios yet observed. Within the limits of the observational and modeling uncertainties, it is possible to explain the derived C3HD/C3H2 ratios by ion-molecule chemistry if e is equal to about 3 x 10 to the -7th.
ISSN:	0004-637X 1538-4357
DOI:	10.1086/166150