3 years ago

Positron Transport And Annihilation In The Galactic Bulge.

Fiona H. Panther

The annihilation of positrons in the Milky Way galaxy has been observed for $\sim 50$ years however the production sites of these positrons remains hard to identify. The observed morphology of positron annihilation gamma rays provides information on the annihilation sites of these Galactic positrons. Most sources of MeV positrons like those responsible for the annihilation signal occupy the thin, star forming disk of the Milky Way. If positrons propagate far from their sources, we must develop accurate models of positron propagation through all ISM phases in order to reveal the mysterious origin of these Galactic positrons. On the other hand, if positrons annihilate close to their sources, a new positron source with a distribution that matches the annihilation morphology must be identified. In this work, I discuss the various models that have been developed to understand the origin of the Galactic bulge annihilation line, and the propagation of positrons in the ISM.

Publisher URL: http://arxiv.org/abs/1801.09365

DOI: arXiv:1801.09365v1

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