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Observations of dwarf galaxies and of the Milky Way halo with currentground-based Cherenkov telescopes have resulted in interesting limits on thecross-section for dark matter (DM) self- annihilation for WIMP masses abovesome 100 GeV. The future Cherenkov Telescope Array (CTA) is expected to furtherexplore the parameter space of dark matter candidates that are predicted inextensions of the standard model of particle physics. Due to its low energythreshold (of order of few tens of GeV) and high sensitivity, CTA will alsoprobe lower WIMP masses than current experiments, but the actual performance inthis regime will be influenced by the altitude of the observatory above sealevel. Using the response of possible CTA candidate arrays to simulated photonsand hadrons, we estimate how searches for a WIMP annihilation signal from theMilky Way halo will be influenced by altitude of different possible CTA sites.

Impact of the Cherenkov Telescope Array (CTA) altitude on Dark Matter searches in the Milky Way Halo