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Constraints on 3.55 keV line emission from stacked observations of dwarf spheroidal galaxies

Eckert, D.; Malyshev, D.; Neronov, A.

Several recent works have reported the detection of an unidentified x-ray line at 3.55 keV, which could possibly be attributed to the decay of dark matter (DM) particles in the halos of galaxy clusters and in the M31 galaxy. We analyze all publicly available XMM-Newton satellite data of dwarf spheroidal galaxies to test the possible DM origin of t…