Interstellar triply deuterated ammonia

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

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http://salesiana.dossiersoluciones.com/handle/123456789/5511

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/astro-ph/0212324
 http://arxiv.org/abs/astro-ph/0212324

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arXiv