Observability of Gamma Rays from Dark Matter Neutralino Annihilations in the Milky Way Halo

摘要: Recent advances in N-body simulations of cold dark matter halos point to a substantial density enhancement near the center. This means that, e.g., $\gamma$ ray signals from neutralino annihilations would be significantly enhanced compared old estimates based on an isothermal sphere model with large core radius. Another important development concerns new detectors, both space- and ground-based, which will cover window between 50 300 GeV where presently no cosmic $\gamma$-ray data are available. Thirdly, calculations line signal (a sharp spike $10^{-3}$ relative width) have revealed hitherto neglected contribution which, for heavy higgsino-like neutralinos, gives annihilation rate order magnitude larger than previously predicted. We make detailed phenomenological study possible detection rates given these three pieces information. show that proposed upgrade Whipple telescope it sensitive region parameter space, improvements planned generation Air Cherenkov Telescope Arrays. also comment potential GLAST satellite detector. An evaluation continuum $\gamma$-rays produced into main modes is done. It shown combination high-rate models very peaked halo already severely constrained by existing data.