Neutralino annihilation into gamma-rays in the Milky Way and in external galaxies

Abstract

We discuss the gamma-ray signal from dark matter annihilation in our Galaxy and in external objects, namely the Large Magellanic Cloud, the Andromeda Galaxy (M31) and M87. We derive predictions for the fluxes in a low energy realization of the Minimal Supersymmetric Standard Model and compare them with current data from EGRET, CANGAROO-II and HEGRA and with the capabilities of new-generation satellite-borne experiments, like GLAST, and ground-based Cerenkov telescopes, like VERITAS. We find fluxes below the level required to explain the possible indications of a gamma-ray excess shown by CANGAROO-II (toward the Galactic Center) and HEGRA (from M87). As far as future experiments are concerned, we show that only the signal from the galactic center could be accessible to both satellite-borne experiments and to ACTs, even though this requires very steep dark matter density profiles.

arXiv comment17 pages, 9 tables and 14 figures, typeset with ReVTeX4. A Figure and a comment on the recent HESS data have been added. The version on the archive has low-resolution figures. The paper with high resolution figures may be found through http://www.astroparticle.to.infn.it

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