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Consistency of dark matter interpretations of the 3.5 keV X-ray line · Around

2014

Consistency of dark matter interpretations of the 3.5 keV X-ray line

Cline, James M., Frey, Andrew R.

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Tentative evidence of a 3.5 keV X-ray line has been found in the stacked spectra of galaxy clusters, individual clusters, the Andromeda galaxy and the galactic center, leading to speculation that it could be due to decays of metastable dark matter such as sterile neutrinos.

However searches for the line in other systems such as dwarf satellites of the Milky Way have given negative or ambiguous results.
We reanalyze both the positive and negative searches from the point of view that the line is due to inelastic scattering of dark matter to an excited state that subsequently decays---the mechanism of excited dark matter (XDM).
Unlike the metastable dark matter scenario, XDM gives a stronger signal in systems with higher velocity dispersions, such as galaxy clusters.

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