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Positron annihilation on polycyclic aromatic hydrocarbon molecules in the interstellar medium
KTH, School of Engineering Sciences (SCI), Physics.
2010 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 402, no 2, 1171-1178 p.Article in journal (Refereed) Published
Abstract [en]

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 x 10(-7) for the PAH abundance (by number, relative to hydrogen).

Place, publisher, year, edition, pages
2010. Vol. 402, no 2, 1171-1178 p.
Keyword [en]
ISM: abundances, ISM: molecules, gamma-rays: theory
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-28827DOI: 10.1111/j.1365-2966.2009.15954.xISI: 000274242900036Scopus ID: 2-s2.0-77949335204OAI: oai:DiVA.org:kth-28827DiVA: diva2:396832
Note
QC 20110211Available from: 2011-02-11 Created: 2011-01-21 Last updated: 2017-12-11Bibliographically approved

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