Fermi 130 GeV gamma-ray excess and dark matter annihilation in sub-haloes and in the Galactic centre

By Elmo Tempel, A. Hektor, M. Raidal. 2012

174 citations recorded by the source corpus.

We analyze publicly available Fermi-LAT high-energy gamma-ray data and confirm the existence of clear spectral feature peaked at Eγ = 130 GeV. Scanning over the Galaxy we identify several disconnected regions where the observed excess originates from. Our best optimized fit is obtained for the central region of Galaxy with a clear peak at 130 GeV with local statistical significance 4.5σ. The observed excess is not correlated with Fermi bubbles. We compute the photon spectra induced by dark matter annihilations into two and four standard model particles, the latter via two light intermediate states, and fit the spectra with data. Since our fits indicate sharper and higher signal peak than in the previous works, data favors dark matter direct two-body annihilation channels into photons or other channels giving only line-like spectra. If Einasto halo profile correctly predicts the central cusp of Galaxy, dark matter annihilation cross-section to two photons is of order ten percent of the standard thermal freeze-out cross-section. The large dark matter two-body annihilation cross-section to photons may signal a new resonance that should be searched for at the CERN LHC experiments.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/78c41a9a7d5ab568e6e117f1478276ba9d15c7a8

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In Nuclear and High Energy Physics

Citations in the corpus

Double-Disk Dark Matter (2013, background): “The Fermi 130 GeV line is arguably off center [76,77], which has provoked some debate, with numerical simulations showing that dark matter may be displaced from the galactic center [106] and others arguing that tidal disruption prohibits such a displacement [107].”
Gamma Ray Signals from Dark Matter: Concepts, Status and Prospects (2012, methodology): “erms of DM annihilation. Later, Su & Finkbeiner [246] adopted a reﬁned spatial template analysis to demonstrate that the existence of a gamma-ray line emitting region of radius ∼3◦ (see also Ref. [245]) close to the GC is preferred over the no line hypothesis with a global signiﬁcance of more th”
Search for gamma-ray spectral lines with the Fermi Large Area Telescope and dark matter implications (2013, unknown): “This feature has been detected more significantly in spectra containing γ rays near the GC [49, 39, 50, 51], nearby galaxy clusters [52], and unassociated LAT sources [53] (see also [54]).”