Triply deuterated ammonia in NGC 1333

  title={Triply deuterated ammonia in NGC 1333},
  author={Floris van der Tak and Peter Schilke and Holger S. P. Muller and Dariusz C. Lis and Thomas G. Phillips and Maryvonne Gerin and {\`E}velyne Roueff},
  journal={Astronomy and Astrophysics},
The Caltech Submillimeter Observatory has detected triply deuterated ammonia, ND3, through its JK =1 a! 0 s transition near 310 GHz. Emission is found in the NGC 1333 region, both towards IRAS 4A and a position to the South-East where DCO + peaks. In both cases, the hyperne ratio indicates that the emission is optically thin. Column densities of ND3 are 3 610 11 cm 2 for Tex = 10 K and twice as high for Tex = 5 K. Using a Monte Carlo radiative transfer code and a model of the structure of the… 

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