The XMM Cluster Survey:new evidence for the 3.5 keV feature in clusters is inconsistent with a dark matter origin
- Bhargava, S.
- Giles, P. A.
- Romer, A. K.
- Jeltema, T.
- Mayers, J.
- Bermeo, A.
- Hilton, M.
- Wilkinson, R.
- Vergara, C.
- Collins, C. A.
- Manolopoulou, M.
- Rooney, P. J.
- Rosborough, S.
- Sabirli, K.
- Stott, J. P.
- Swann, E.
- Viana, P. T. P.
DOIAbstract
There have been several reports of a detection of an unexplained excess of X-ray emission at ≃ 3.5 keV in astrophysical systems. One interpretation of this excess is the decay of sterile neutrino dark matter. The most influential study to date analysed 73 clusters observed by the XMM-Newton satellite. We explore evidence for a ≃ 3.5 keV excess in the XMM-PN spectra of 117 redMaPPer galaxy clusters (0.1 < z <0.6). In our analysis of individual spectra, we identify three systems with an excess of flux at ≃ 3.5 keV. In one case (XCS J0003.3+0204) this excess may result from a discrete emission line. None of these systems are the most dark matter dominated in our sample. We group the remaining 114 clusters into four temperature (TX) bins to sea...
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