  The nature of the cosmic dark matter is unknown. The most compelling
hypothesis is that dark matter consists of weakly interacting massive particles
(WIMPs) in the 100 GeV mass range. Such particles would annihilate in the
galactic halo, producing high-energy gamma rays which might be detectable in
gamma ray telescopes such as the GLAST satellite. We investigate the ability of
GLAST to distinguish between WIMP annihilation sources and astrophysical
sources. Focusing on the galactic satellite halos predicted by the cold dark
matter model, we find that the WIMP gamma-ray spectrum is nearly unique;
separation of the brightest WIMP sources from known source classes can be done
in a convincing way by including spectral and spatial information. Candidate
WIMP sources can be further studied with Imaging Atmospheric Cerenkov
Telescopes. Finally, Large Hadron Collider data might have a crucial impact on
the study of galactic dark matter.
