  Split supersymmetry scenarios with PeV-scale scalar masses circumvent many of
the restrictions on supersymmetry coming from experimental limits on CP
violation, flavor-changing neutral currents, and the Higgs boson mass. We
consider the situation where the LSP is either a Wino or Higgsino and the
majority of its cold dark matter relic density is of thermal origin, in which
case its mass is specified to be 2.3 TeV for a Wino or 1.1 TeV for a Higgsino.
We examine the potential for indirect detection, at present and future
gamma-ray telescopes, of the monoenergetic photon lines that would result from
the annihilation of these particles near the galactic center. We show how the
possibility for detection depends on the precise form of the galactic
dark-matter halo profile and examine what performance attributes a gamma-ray
detector would need in order to register a 5-sigma discovery.
