Hydrocarbon anions in interstellar clouds and circumstellar envelopes

Details Hydrocarbon anions in interstellar clouds and circumstellar envelopes Hydrocarbon anions in interstellar clouds and circumstellar envelopes

2007-05-04

arxiv.org/abs/0705.0639v2

Astronomy and Astrophysics

Astrophysics

To be be published in The Astrophysical Journal Letters. 16 pages, 5 tables, 3 figures. Latex typos corrected

Scientific paper

10.1086/519376

The recent detection of the hydrocarbon anion C6H- in the interstellar medium has led us to investigate the synthesis of hydrocarbon anions in a variety of interstellar and circumstellar environments. We find that the anion/neutral abundance ratio can be quite large, on the order of at least a few percent, once the neutral has more than five carbon atoms. Detailed modeling shows that the column densities of C6H- observed in IRC+10216 and TMC-1 can be reproduced. Our calculations also predict that other hydrocarbon anions, such as C4H- and C8H-, are viable candidates for detection in IRC+10216, TMC-1 and photon-dominated regions such as the Horsehead Nebula.

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