Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-06-30
JCAP 1010:016,2010
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
25 pages, 6 figures. References added, model identification section modified, general conclusions unchanged. Final version acc
Scientific paper
10.1088/1475-7516/2010/10/016
If the positron fraction and combined electron-positron flux excesses recently observed by PAMELA, FERMI and HESS are due to dark matter annihilation into lepton-rich final states, the accompanying final state radiation (FSR) photons may be detected by ground-based atmospheric Cherenkov telescopes (ACTs). Satellite dwarf galaxies in the vicinity of the Milky Way are particularly promising targets for this search. We find that current and near-future ACTs have an excellent potential for discovering the FSR photons from dwarfs, although a discovery cannot be guaranteed due to large uncertainties in the fluxes resulting from lack of precise knowledge of dark matter distribution within the dwarfs. We also investigate the possibility of discriminating between different dark matter models based on the measured FSR photon spectrum. For typical parameters, we find that the ACTs can reliably distinguish models predicting dark matter annihilation into two-lepton final states from those favoring four-lepton final states (as in, for example, "axion portal" models). In addition, we find that the dark matter particle mass can also be determined from the FSR spectrum.
Perelstein Maxim
Shakya Bibhushan
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