Journal Article

Positron annihilation on polycyclic aromatic hydrocarbon molecules in the interstellar medium

N. Guessoum, P. Jean and W. Gillard

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 402, issue 2, pages 1171-1178
Published in print February 2010 | ISSN: 0035-8711
Published online February 2010 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1111/j.1365-2966.2009.15954.x
Positron annihilation on polycyclic aromatic hydrocarbon molecules in the interstellar medium

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We examine the annihilation of positrons on polycyclic aromatic hydrocarbon (PAH) molecules in interstellar medium (ISM) conditions. We estimate the annihilation rates of positrons on PAHs by a semi-empirical approach. We show that PAHs can play a significant role in the overall Galactic positron annihilation picture and use the annihilation rates and International Gamma-Ray Astrophysics Laboratory Galactic emission measurements to constrain the number of PAHs present in the ISM. We find an upper limit of 4.6 × 10−7 for the PAH abundance (by number, relative to hydrogen).

Keywords: ISM: abundances; ISM: molecules; gamma-rays: theory

Journal Article.  6626 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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