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

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Shah,  Chintan
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Dobrodey,  Stepan
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Bernitt,  Sven
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Steinbrügge,  René Friedrich
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Crespo López-Urrutia,  José R.
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Citation

Shah, C., Dobrodey, S., Bernitt, S., Steinbrügge, R. F., Gu, L., Kaastra, J., et al. (2017). Laboratory measurements compellingly supports a charge-exchange mechanism for the "Dark matter" ~ 3.5 keV X-ray line. Journal of Physics: Conference Series, 875: 052039. doi:doi:10.1088/1742-6596/875/6/052039.


Cite as: http://hdl.handle.net/21.11116/0000-0000-F7B5-D
Abstract
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.