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The standard model of particle physics assumes that neutrinos are massless,although adding non-zeros is required by the experimentally establishedphenomenon of neutrino oscillations requires neutrinos to have non-zero mass.Sterile neutrinos (or right-handed neutrinos) are a good warm dark mattercandidate. We find that the excess of the intensity in the 8.7 keV line (at theenergy of the FeXXVI Ly$\gamma$ line) in the spectrum of the Galactic centerobserved by the Suzaku X-ray mission cannot be explained by standard ionizationand recombination processes. We suggest that the origin of this excess is viadecays of sterile neutrinos with a mass of 17.4 keV and estimate the value ofthe mixing angle. The estimated value of the mixing angle $\sin^2(2\theta)=(4.1\pm 2.2)\times10^{-12}$ lies in the allowed region of the mixing angle of darkmatter sterile neutrino with a mass of 17-18 keV.

Can the excess in the FeXXVI Ly gamma line from the Galactic Center provide evidence for 17 keV sterile neutrinos?