Speaker
Description
The Galactic Annihilation Line Explorer (GALE) mission will address a long-outstanding question in our understanding of the sources of Galactic positrons: whether they are produced by unresolved astrophysical sources or created via diffuse processes, possibly due to dark matter decay and/or annihilation. The problem of Galactic positrons that produce 511-keV gamma-ray emission from the Galactic plane and Galactic Center has existed for years and is well-defined with the measurements by INTEGRAL/SPI. GALE is designed to achieve the needed angular resolution (fraction of a degree) and point source sensitivity (< 10^-4 ph/cm^2/s) required to understand the 511-keV emission structure in the Galactic Center. The GALE instrument combines a coded-aperture mask (CAM) with a cadmium-zinc-telluride imaging calorimeter to form a combined CAM/Compton telescope. The Wallops Arc-Second Pointer (WASP) support system will be used to achieve the precise telescope pointing control to the GC and for the coded aperture imaging proper operation. In this talk, the science goals, GALE instrument design, anticipated performance and mission will be discussed.
| Collaboration(s) | GALE |
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