The Effects of Molecular Anions on the Chemistry of Dark Clouds

Details The Effects of Molecular Anions on the Chemistry of Dark Clouds The Effects of Molecular Anions on the Chemistry of Dark Clouds

2009-05-06

arxiv.org/abs/0905.0800v1

Astrophys.J.700:752-761,2009

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Accepted for publication in ApJ, 24 pages, 5 figures

Scientific paper

10.1088/0004-637X/700/1/752

We have investigated the role of molecular anion chemistry in pseudo-time dependent chemical models of dark clouds. With oxygen-rich elemental abundances, the addition of anions results in a slight improvement in the overall agreement between model results and observations of molecular abundances in TMC-1 (CP). More importantly, with the inclusion of anions, we see an enhanced production efficiency of unsaturated carbon-chain neutral molecules, especially in the longer members of the families CnH, CnH2, and HCnN. The use of carbon-rich elemental abundances in models of TMC-1 (CP) with anion chemistry worsens the agreement with observations obtained in the absence of anions.

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