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An unidentified line at energy around 3.5 keV was detected in the spectra ofdark matter-dominated objects. Recent work of Dessert et al. [1812.06976] used30 Msec of XMM-Newton blank-sky observations to constrain the admissible lineflux, challenging its dark matter decay origin. We demonstrate that thesebounds are overestimated by more than an order of magnitude due to improperbackground modeling. Therefore the dark matter interpretation of the 3.5 keVsignal remains viable.

Technical comment on the paper of Dessert et al. "The dark matter interpretation of the 3.5 keV line is inconsistent with blank-sky observations"