Checking the dark matter origin of 3.53 keV line with the Milky Way
  center
  We detect a line at 3.539 +/- 0.011 keV in the deep exposure dataset of the
Galactic Center region, observed with the XMM-Newton. The dark matter
interpretation of the signal observed in the Perseus galaxy cluster, the
Andromeda galaxy [1402.4119] and in the stacked spectra of galaxy clusters
[1402.2301], together with non-observation of the line in blank sky data, put
both lower and upper limits on the possible intensity of the line in the
Galactic Center data. Our result is consistent with these constraints for a
class of Milky Way mass models, presented previously by observers, and would
correspond to radiative decay dark matter lifetime tau_dm ~ (6-8) x 10^{27}
sec. Although it is hard to exclude an astrophysical origin of this line based
the Galactic Center data alone, this is an important consistency check of the
hypothesis that encourages to check it with more observational data that are
expected by the end of 2015.
