Journal
ASTROPHYSICAL JOURNAL
Volume 662, Issue 2, Pages L87-L90Publisher
IOP PUBLISHING LTD
DOI: 10.1086/519376
Keywords
astrochemistry; ISM : abundances; ISM : clouds; ISM : molecules; stars : carbon
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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 + 10 216 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 + 10 216, TMC-1, and photon-dominated regions such as the Horsehead Nebula.
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