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We searched for an X-ray line at energies around 3.5 keV in deep, ~1.6 MsecXMM-Newton observations of the dwarf spheroidal galaxy Draco. No line was foundin either the MOS or the PN detectors. The data in this energy range arecompletely consistent with a single, unfolded power law modeling the particlebackground, which dominates at these energies, plus instrumental lines; theaddition of a ~3.5 keV line feature gives no improvement to the fit. Thecorresponding upper limit on the line flux rules out a dark matter decay originfor the 3.5 keV line found in observations of clusters of galaxies and in theGalactic Center at greater than 99% C.L..

Deep XMM Observations of Draco rule out at the 99% Confidence Level a Dark Matter Decay Origin for the 3.5 keV Line