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Riemer-Sørensen, S; Wik, D; Madejski, G; Molendi, S; Gastaldello, F; Harrison, F A; Craig, W W; Hailey, C J; Boggs, S E; Christensen, F E; Stern, D; Zhang, W W; Hornstrup, A
arXiv.org, 07/2015Paper, Journal Article
Line emission from dark matter is well motivated for some candidates e.g. sterile neutrinos. We present the first search for dark matter line emission in the 3-80keV range in a pointed observation of the Bullet Cluster with NuSTAR. We do not detect any significant line emission and instead we derive upper limits (95% CL) on the flux, and interpret these constraints in the context of sterile neutrinos and more generic dark matter candidates. NuSTAR does not have the sensitivity to constrain the recently claimed line detection at 3.5keV, but improves on the constraints for energies of 10-25keV.
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