Organic molecular anions in interstellar and circumstellar environments

Details Organic molecular anions in interstellar and circumstellar environments Organic molecular anions in interstellar and circumstellar environments

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008iaus..251..157c&link_type=abstract

Organic Matter in Space, Proceedings of the International Astronomical Union, IAU Symposium, Volume 251, p. 157-160

Astronomy and Astrophysics

Astronomy

4

Astrochemistry, Ism: Molecules, Ism: Abundances, Ism: Clouds, Stars: Carbon

Scientific paper

The synthesis of organic molecular anions in TMC-1 and IRC+10216 is investigated. Modelled C2H-, CN-, C3N-, C5N- and C7N- column densities are sufficiently great that these species might be observable in IRC+10216. Density-enhanced shells in the outer envelope of IRC+10216 are found to enhance the C2H- and CN- column densities by shielding these anions from destruction by UV radiation. From a newly-derived upper column density limit of 6.6 × 1010 cm-2 for C2H- in IRC+10216 we deduce the primary production mechanism for this anion to be C2H2 + H- ⇒ C2H- + H2. In TMC-1, due to the low radiative electron attachment rates calculated for C2H-, CN- and CH2CN-, these species have modelled column densities below the detection threshold. They could, however, be produced in reactions we have not yet considered.

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