Dark matter line search using a joint analysis of dwarf galaxies with the Fermi Gamma-ray Space Telescope
2012; American Physical Society; Volume: 86; Issue: 2 Linguagem: Inglês
10.1103/physrevd.86.021302
ISSN1550-7998
AutoresAlex Geringer-Sameth, Savvas M. Koushiappas,
Tópico(s)Particle physics theoretical and experimental studies
ResumoWe perform a joint analysis of dwarf galaxy data from the Fermi Gamma-ray Space Telescope in search of dark matter annihilation into a gamma-ray line. We employ a novel statistical method that takes into account the spatial and spectral information of individual photon events from a sample of seven dwarf galaxies. Dwarf galaxies show no evidence of a gamma-ray line between 10 GeV and 1 TeV. The subsequent upper limit on the annihilation cross section to a two-photon final state is ${3.9}_{\ensuremath{-}3.7}^{+7.1}\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}26}\text{ }\text{ }{\mathrm{cm}}^{3}\text{ }{\mathrm{s}}^{\ensuremath{-}1}$ at 130 GeV, where the errors reflect the systematic uncertainty in the distribution of dark matter within the dwarf galaxies.
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