Positron Annihilation on Polycyclic Aromatic Hydrocarbon molecules in the Interstellar Medium
N. Guessoum (1), P. Jean (2), W. Gillard (3) ((1) American University, of Sharjah, (2) CESR CNRS/Universite de Toulouse, (3) KTH AlbaNova University, Centre Stockholm)
TL;DR
This study investigates how positrons annihilate on PAH molecules in the interstellar medium, estimating their rates and constraining PAH abundance based on galactic emission data.
Contribution
It introduces a semi-empirical method to estimate positron annihilation rates on PAHs and constrains their abundance in the interstellar medium.
Findings
PAHs significantly contribute to galactic positron annihilation
Upper limit of PAH abundance in ISM is 4.6 x 10^-7
Method links annihilation rates with galactic emission measurements
Abstract
We examine the annihilation of positrons on polycyclic aromatic hydrocarbon (PAH) molecules in interstellar medium 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 INTEGRAL galactic emission measurements to constrain the amount of PAHs present in the ISM. We find an upper limit of 4.6 x 10^-7 for the PAH abundance.
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