期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 458, 期 4, 页码 3592-3596出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw578
关键词
line: identification; dark matter; X-rays: galaxies; X-rays: galaxies: clusters; X-rays: ISM
资金
- NSF [AST 1517545]
- US Department of Energy [DE-SC0010107-001]
- NSF [AST 1517545]
- US Department of Energy [DE-SC0010107-001]
We searched for an X-ray line at energies around 3.5 keV in deep, similar to 1.6 Ms XMM-Newton observations of the dwarf spheroidal galaxy Draco. No line was found in either the Metal Oxide Semi-conductor (MOS) or the p-type/n-type semiconductor (PN) detectors. The data in this energy range are completely consistent with a single, unfolded power-law modelling the particle background, which dominates at these energies, plus instrumental lines; the addition of a similar to 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 Centre at greater than 99 per cent confidence level.
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