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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 | | Affiliation: | Fermilab), Andrew R. Zentner (KICP, UChicago), Joseph Silk (Oxford | | Abstract: | We 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 | | Services: | Forum | Review | PDF | Favorites | |
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