Deuterated Ammonia in Galactic Protostellar Cores

Details Deuterated Ammonia in Galactic Protostellar Cores Deuterated Ammonia in Galactic Protostellar Cores

2001-03-16

arxiv.org/abs/astro-ph/0103264v1

Astronomy and Astrophysics

Astrophysics

16 Pages, 7 Figures, Accepted to Ap.J., to appear in the June 20, 2001 edition

Scientific paper

10.1086/321396

We report on a survey of \nh2d towards protostellar cores in low-mass star formation and quiescent regions in the Galaxy. Twenty-three out of thirty-two observed sources have significant ($\gsim 5\sigma$) \nh2d emission. Ion-molecule chemistry, which preferentially enhances deuterium in molecules above its cosmological value of \scnot{1.6}{-5} sufficiently explains these abundances. NH2D/NH3 ratios towards Class 0 sources yields information about the ``fossil remnants'' from the era prior to the onset of core collapse and star formation. We compare our observations with predictions of gas-phase chemical networks.

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