We investigate if the gamma ray halo, for which recent evidence has been
found in EGRET data, can be explained by neutralino annihilations in a clumpy
halo. We find that the measured excess gamma ray flux can be explained through
a moderate amount of clumping in the halo. Moreover, the required amount of
clumping implies also a measureable excess of antiprotons at low energies, for
which there is support from recent measurements by the BESS collaboration. The
predicted antiproton fluxes resulting from neutralino annihilations in a clumpy
halo are high enough to give an excess over cosmic-ray produced antiprotons
also at moderately high energies (above a few GeV). This prediction, as well as
that of one or two sharp gamma lines coming from annihilations into 2 gammas or
Z gamma can be tested in upcoming space-borne experiments like AMS and GLAST.Comment: 5 pages, 3 eps-figures (included), LaTeX, uses RevTe
