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

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arxiv 1512.01239 v2 pith:LLJBLKXL submitted 2015-12-03 astro-ph.HE astro-ph.COastro-ph.GAhep-ph

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

classification astro-ph.HE astro-ph.COastro-ph.GAhep-ph
keywords lineobservationsdarkdecaydeepdracoenergiesfound
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We searched for an X-ray line at energies around 3.5 keV in deep, ~1.6 Msec XMM-Newton observations of the dwarf spheroidal galaxy Draco. No line was found in either the MOS or the PN detectors. The data in this energy range are completely consistent with a single, unfolded power law modeling the particle background, which dominates at these energies, plus instrumental lines; the addition of a ~3.5 keV line feature gives no improvement to the fit. The corresponding upper limit on the line flux rules out a dark matter decay origin for the 3.5 keV line found in observations of clusters of galaxies and in the Galactic Center at greater than 99% C.L..

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