Positrons in the Galaxy: their births, marriages and deaths

Details Positrons in the Galaxy: their births, marriages and deaths Positrons in the Galaxy: their births, marriages and deaths

2010-09-10

arxiv.org/abs/1009.2098v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

To be published in the Proceedings of the Vulcano Workshop 2010 "Frontier Objects in Astrophysics and Particle Physics", Vulca

Scientific paper

High energy (~GeV) positrons are seen within cosmic rays and observation of a narrow line at 511 keV shows that positrons are annihilating in the galaxy after slowing down to ~keV energies or less. Our state of knowledge of the origin of these positrons, of the formation of positronium 'atoms', and of the circumstances of their annihilation or escape from the galaxy are reviewed and the question of whether the two phenomena are linked is discussed.

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