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29 March 2024
 
  » arxiv » astro-ph/0509565

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A New Signature of Dark Matter Annihilations: Gamma-Rays from Intermediate-Mass Black Holes
Gianfranco Bertone ; Andrew R. Zentner ; Joseph Silk ;
Date 19 Sep 2005
Subject astro-ph hep-ph
AffiliationFermilab), Andrew R. Zentner (KICP, UChicago), Joseph Silk (Oxford
AbstractWe study the prospects for detecting gamma-rays from Dark Matter (DM) annihilations in enhancements of the DM density (mini-spikes) around intermediate-mass black holes with masses in the range $10^2 lsim M / msun lsim 10^6$. Focusing on two different IMBH formation scenarios, we show that, for typical values of mass and cross section of common DM candidates, mini-spikes, produced by the adiabatic growth of DM around pregalactic IMBHs, would be bright sources of gamma-rays, which could be easily detected with large field-of-view gamma-ray experiments such as GLAST, and further studied with smaller field-of-view, larger-area experiments like Air Cherenkov Telescopes CANGAROO, HESS, MAGIC and VERITAS. The detection of many gamma-ray sources not associated with a luminous component of the Local Group, and with identical cut-offs in their energy spectra at the mass of the DM particle, would provide a potential smoking-gun signature of DM annihilations and shed new light on the nature of intermediate and supermassive Black Holes.
Source arXiv, astro-ph/0509565
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