Positron annihilation on polycyclic aromatic hydrocarbon molecules in the interstellar medium

被引：23
|
作者：
Guessoum, N. [1 ]
Jean, P. [2 ]
Gillard, W. [3 ]
机构：
[1] American Univ Sharjah, Dept Phys, Sharjah, U Arab Emirates
[2] Univ Toulouse, CNRS, CESR, F-31028 Toulouse 4, France
[3] AlbaNova Univ Ctr, Dept Phys, KTH, SE-10691 Stockholm, Sweden
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2010年 / 402卷 / 02期
关键词：
ISM: abundances; ISM: molecules; gamma-rays: theory; GALACTIC-CENTER; SKY DISTRIBUTION; EMISSION; RADIATION; SPECTRUM; DUST; PHYSICS; BANDS; ATOMS; LINE;
D O I：
10.1111/j.1365-2966.2009.15954.x
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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).
引用
收藏
页码：1171 / 1178
页数：8
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