SIMBAD references

2001ApJ...554..933S - Astrophys. J., 554, 933-947 (2001/June-3)

Deuterated ammonia in galactic protostellar cores.


Abstract (from CDS):

We report on a survey of NH2D toward protostellar cores in low-mass star formation and quiescent regions in the Galaxy. Twenty-three out of thirty-two observed sources have significant (≳5 σ) NH2D emission. Ion-molecule chemistry, which preferentially enhances deuterium in molecules above the local interstellar medium value value of 1.6x10–5, sufficiently explains these abundances. NH2D/NH3 ratios toward 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.

Abstract Copyright:

Journal keyword(s): ISM: Abundances - ISM: Clouds - ISM: General - ISM: Molecules - Molecular Processes - Radio Lines: ISM

CDS comments: Table 1: TMC-1-AM and TMC-1CY not in SIMBAD.

Simbad objects: 41

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