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Recently a series of indications have been put forward suggesting thepresence of two gamma-ray lines at 110-130 GeV (centered at 111 and 129 GeV).Signals of these lines have been observed toward the Galactic center, at somegalaxy clusters and among some of the unassociated point sources of the 2 yearsFermi catalogue. Such a combination of signals could be generated by darkmatter annihilations in the main dark matter halo, its substructures and nearbygalaxy clusters. We discuss in this work the consistency between the number ofevents observed at the line energies in the sky and the predictions usingresults from the Via Lactea II numerical simulation and extrapolations belowits mass resolution, taking into account that the annihilation cross-section tothe lines can be estimated from the Galactic center signal. We find that someextrapolations to small substructures can naturally account for the pointsources signal, although the hypothesis of background only cannot be rejected.We also study the morphology of the gamma-ray sky at the 2 lines energies,testing different Galactic diffuse background models to account forinterstellar medium uncertainties, and different assumptions on the DM diffusecomponent profile. We find from template fits that within reasonable diffusebackground uncertainties the presence of a spherical halo component ispreferred with cuspier dark matter halo profiles being preferable even from thefull sky fit. We finally check the impact of a dark disk component, suggestedby cosmological simulations that include baryons and find that thin dark diskscan not be disfavored, thus possibly accounting for the preferentially closerto the Galactic disk distribution of the point sources lines signal.

The 111 and 129 GeV gamma-ray lines from annihilations in the Milky Way dark matter halo, dark disk and subhalos