Interstellar triply deuterated ammonia

Details Interstellar triply deuterated ammonia Interstellar triply deuterated ammonia

2002-12-13

arxiv.org/abs/astro-ph/0212324v1

Astronomy and Astrophysics

Astrophysics

Four pages, one colour figure. to appear in: Chemistry as a diagnostic of star formation, eds. C.L. Curry & M. Fich (NRC Press

Scientific paper

Research on interstellar ND3 is reviewed and updated from the discovery papers. Results from observations of a dozen sources at centimeter and submillimeter wavelengths are presented. The two data sets are consistent, but do not constrain the excitation conditions in the ND3-emitting gas. The column density ratios of NH3:NH2D, NH2D:ND2H and ND2H:ND3, observed in similar sized beams, are ~10, and present a challenge for both the gas-phase and the grain-surface chemistry scenarios of deuterium fractionation. The role of shocks and of CO depletion in deuterium chemistry is discussed.

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