Abstract
The source of Galactic positron annihilation emission is a mystery. What is known is that photons produced in positron-electron annihilation are highly concentrated at the Galactic centre, with a slightly off-centred peak with respect to Galactic longitude. Using synthetic models of the Milky Way we find possible connections between age-bound stellar structures in the Milky Way and the 511 keV annihilation morphology. We find that in projection, the flux of the old tilted stellar bulge/bar can reproduce the Gaussian fit parameters and the apparent asymmetry observed in the radiation, supporting a large number of annihilation sources in an extended bulge/bar population. When looking at the same stars in the disk we were not able to reproduce the bulge to disk ratio in flux, indicating either a different class of sources in the disk or significant positron propagation out of the bulge.
| Original language | English |
|---|---|
| Pages (from-to) | 1-6 |
| Number of pages | 6 |
| Journal | Proceedings of Science |
| DOIs | |
| Publication status | Published - 1 Dec 2011 |
| Externally published | Yes |
| Event | INTEGRAL - A Science Workshop in Sardinia: The Extreme and Variable High Energy Sky, Extremesky 2011 - Cagliari, Italy Duration: 19 Sept 2011 → 23 Sept 2011 |
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