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Searching for decaying dark matter in deep<i>XMM–Newton</i>observation of the Draco dwarf spheroidal
We present results of a search for the 3.5 keV emission line in our recent very long (∼ 1.4 Ms) XMM–Newton observation of the Draco dwarf spheroidal galaxy. The astrophysical X-ray emission from such dark matter-dominated galaxies is faint, thus they provide a test for the dark matter origin of …