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Sgr A* as Source of the Positrons Observed in the Galactic Center Region

  • Pierre Jean (a1), Nidhal Guessoum (a2) and Katia Ferrière (a1)

Abstract

We explore the possibility that a substantial fraction of the positrons observed to annihilate in the central region of our Galaxy come from the supermassive black hole Sgr A* that lies at the center. This idea was proposed by several authors, but the propagation of the emitted positrons into the bulge and beyond remained a serious problem for models of the origin of GC positrons.

We assume models of positron production with different energies. The propagation of positrons from their production site is followed in detail with Monte-Carlo simulations, taking into account the physical conditions of the propagation regions as well as various physical interactions. Using the known physics of positron annihilation in astrophysical environments, we calculate the properties of the annihilation emission (time evolution and spatial distribution) for the different models under consideration.

We present the results of these simulations and the conclusions/constraints that can be inferred from them.

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