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          Institute: MPI für Radioastronomie     Collection: Publikationen des MPI für Radioastronomie     Display Documents

ID: 11720.0, MPI für Radioastronomie / Publikationen des MPI für Radioastronomie
Detection of triply deuterated ammonia in the Barnard 1 cloud
Authors:Lis, D. C.; Roueff, E.; Gerin, M.; Phillips, T. G.; Coudert, L. H.; van der Tak, F. F. S.; Schilke, P.
Date of Publication (YYYY-MM-DD):2002-05-20
Title of Journal:Astrophysical Journal
Journal Abbrev.:Astrophys. J.
Issue / Number:1
Start Page:L55
End Page:L58
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We report the detection of the ground-state rotational transition J(K) = 1(0) --> 0(0) (0a --> 0s) of triply deuterated ammonia at 309.91 GHz in the Barnard 1 cloud, obtained with the Caltech Submillimeter Observatory. The observed, integrated, line intensity of 0.307 +/- 0.019 K km s(-1) implies an ND3 column density of (2 +/- 0.9) x 10(12) cm(-2), for excitation temperatures in the range 5-10 K. Using previously published H-2 and NH3 column density estimates in this source, we derive an ND3 fractional abundance with respect to H-2 of (1.5 +/- 1) x 10(-11) and an ND3-to-NH3 abundance ratio of similar to8 x 10(-4). The observed abundance ratios can be explained in the framework of gas-phase chemical models, in which the dissociative recombination of partially deuterated ions results in a somewhat higher probability for the ejection of hydrogen atoms than deuterium.
Free Keywords:ISM : abundances; ISM : individual (Barnard 1); ISM : molecules
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Radioastronomie
External Affiliations:CALTECH, Downs Lab Phys, MS 320-47, Pasadena, CA 91125 USA; CALTECH, Downs Lab Phys, Pasadena, CA 91125 USA; Observ Paris, Sect Meudon, CNRS, FRE 2462,Lab Univers & Theorie, F-92195 Meudon, France; Observ Paris, CNRS, FRE 2460, Lab Etud Rayonnement & Mat Astophys, F-75231 Paris, France; Ecole Normale Super, F-75231 Paris 05, France; Univ Paris 11, CNRS, Photophys Mol Lab, F-91405 Orsay, France; Max Planck Inst Radioastron, D-53121 Bonn, Germany
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