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Astron. Astrophys. 354, L63-L66 (2000)


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Letter to the Editor

Detection of doubly deuterated ammonia in L134N

E. Roueff 1, S. Tiné 2, L.H. Coudert 3, G. Pineau des Forêts 4, E. Falgarone 5 and M. Gerin 6

1 Observatoire de Paris-Meudon and UMR 8631 du CNRS, 92195 Meudon, France (Evelyne.Roueff@obspm.fr)
2 Observatoire de Paris-Meudon and UMR 8631 du CNRS, 92195 Meudon, France (Stefano.Tine@obspm.fr)
3 Laboratoire de Photophysique Moléculaire, 91405 Orsay, France (Laurent.coudert@ppm.u-psud.fr)
4 Observatoire de Paris-Meudon and UMR 8631 du CNRS, 92195 Meudon, France (forets@obspm.fr)
5 Ecole Normale Supérieure and UMR 8540 du CNRS, 75231 Paris, France (Edith.Falgarone@lra.ens.fr)
6 Ecole Normale Supérieure and UMR 8540 du CNRS, 75231 Paris, France (Maryvonne.Gerin@ensapa.ens.fr)

Received 13 January 2000 / Accepted 21 January 2000

Abstract

ND2H has been detected for the first time in the dense core of L134N, at the peak ammonia position. The abundance ratio [ND2H]/[NH2D] is 0.05, a slightly smaller value than the deuterium fractionation observed for ammonia [NH2D]/[NH3] [FORMULA] (Tiné et al. 2000). This is the second doubly deuterated species detected so far in the interstellar medium, and the first one in a cold dense core. The chemical processes leading to the formation of a significant amount of doubly deuterated ammonia ND2H need to be thorougly investigated.

Key words: ISM: individual objects: L134N – ISM: molecules

Send offprint requests to: E. Roueff

Correspondence to: DAEC, Observatoire de Paris-Meudon, 5 Place Janssen, 92195 Meudon, France

© European Southern Observatory (ESO) 2000

Online publication: February 9, 2000

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