The DCN/HCN abundance ratio in hot molecular cores

Details The DCN/HCN abundance ratio in hot molecular cores The DCN/HCN abundance ratio in hot molecular cores

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...332..695h&link_type=abstract

Astronomy and Astrophysics, v.332, p.695-702 (1998)

Astronomy and Astrophysics

Astrophysics

38

Ism: Abundances, Ism: Molecules, Radio Lines: Ism, Molecular Processes

Scientific paper

We have observed the 3-2 transitions of DCN and HC(15) N in a number of hot molecular cores previously surveyed by us with the interesting result that the DCN/HCN ratio is low, a few times 10(-3) , in the hot cores. The abundance ratio of DCN/HCN is derived both `on-core' and `off-core' and, in general is larger at the `off-core' positions. Comparision with chemical models of these sources indicates that DCN liberated from evaporated ices can be destroyed rapidly in the hot gas by reaction with atomic hydrogen, which works to reset the the initial DCN/HCN ratio in the ice to the gas-phase atomic D/H ratio. The low DCN/HCN abundance ratio we measure can be reached in less than 10(4) years, consistent with previous estimates of the core ages, if the activation energy of the reaction is less than 500 K.

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