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The existence of a population of wandering Intermediate Mass Black Holes(IMBHs) is a generic prediction of scenarios that seek to explain the formationof Supermassive Black Holes in terms of growth from massive seeds. The growthof IMBHs may lead to the formation of DM overdensities called "mini-spikes",recently proposed as ideal targets for indirect DM searches. Currentground-based gamma-ray experiments, however, cannot search for these objectsdue to their limited field of view, and it might be challenging to discriminatemini-spikes in the Milky Way from the many astrophysical sources that GLAST isexpected to observe. We show here that gamma-ray experiments can effectivelysearch for IMBHs in the nearby Andromeda galaxy (also known as M31), wheremini-spikes would appear as a distribution of point-sources, isotropicallydistributed in a \thickapprox 3^{\circ} circle around the galactic center. Fora neutralino-like DM candidate with a mass m_{\chi}=150 GeV, up to 20 sourceswould be detected with GLAST (at 5\sigma, in 2 months). With Air CherenkovTelescopes such as MAGIC and VERITAS, up to 10 sources might be detected,provided that the mass of neutralino is in the TeV range or above.Comment: 9 pages, 5 figure

Gamma rays from dark matter minispikes in the Andromeda Galaxy M31