Laboratory measurements compellingly supports a charge-exchange mechanism for the "Dark matter" ∼ 3.5 keV X-ray line

Synopsis The reported observations of an unidentified X-ray line feature at ∼ 3.5 keV from galaxy clusters have driven a lively discussion about its possible dark matter origin. Motivated by this, we have investigated the X-ray spectra of highly ionized bare sulfur ions following charge exchange wit...

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Bibliographic Details
Published in:Journal of physics. Conference series 2017-07, Vol.875 (6), p.52039
Main Authors: Shah, Chintan, Dobrodey, Stepan, Bernitt, Sven, Steinbrügge, René, Gu, Liyi, Kaastra, Jelle, López-Urrutia, José R. Crespo
Format: Article
Language:English
Subjects:
Charge exchange
Dark matter
Electron beams
Galactic clusters
Ions
Physics
Residual gas
X ray spectra
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Summary:Synopsis The reported observations of an unidentified X-ray line feature at ∼ 3.5 keV from galaxy clusters have driven a lively discussion about its possible dark matter origin. Motivated by this, we have investigated the X-ray spectra of highly ionized bare sulfur ions following charge exchange with residual gas in the electron beam ion trap, as a source or a contributor to this X-ray line. The X-ray feature at about 3.5 keV shows up in the experiment, which could explain the the astrophysical observations and confirm the predictions of Gu et al.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/875/6/052039