SIMBAD references

2002ApJ...571L..55L - Astrophys. J., 571, L55-L58 (2002/May-3)

Detection of triply deuterated ammonia in the Barnard 1 cloud.

LIS D.C., ROUEFF E., GERIN M., PHILLIPS T.G., COUDERT L.H., VAN DER TAK F.F.S. and SCHILKE P.

Abstract (from CDS):

We report the detection of the ground-state rotational transition JK=10⟶00 (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)x1012 cm–2, for excitation temperatures in the range 5-10 K. Using previously published H2 and NH3 column density estimates in this source, we derive an ND3 fractional abundance with respect to H2 of (1.5±1)x10–11 and an ND3-to-NH3 abundance ratio of ∼8x10–4. 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.

Abstract Copyright:

Journal keyword(s): ISM: Abundances - ISM: Individual: Name: Barnard 1 - ISM: Molecules

Simbad objects: 6

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2019.12.13-09:08:14

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