This is such a poorly written article that one has to dig a bit deeper to find important details – such as the radiation signature - and there are two bands of interest, according to this
http://www.physics.miami.edu/~galeazzi/x-rays/dxb.html They would be at ¼ keV and ¾ keV which is 250 eV and 750 eV. Both could be Rydberg values associated with fractional hydrogen - f/H – originating in the solar corona. Of interest for the possibility of “local” dark matter is the red-shifted emission line at 3.5 keV but it is probably too energetic for what is seen. Instead a better candidate is the Oort cloud/ Kuiper Belt. We calculate that the Oort contains megatons of iron-nickel (5 Earth mass equivalents) since so many meteors containing these metals originate there. They are Rydberg catalysts, not unlike mu metal. The Oort cloud is a good candidate for the source of x-rays at ¼ and ¾ keV in a role of forming deeper levels of f/H from solar wind as the feedstock. Not to mention that the Chelyabinsk meteor of last year, which originated in the Oort cloud, could have “reignited” a portion of its f/H on entry into the atmosphere. From: Axil Axil http://phys.org/news/2014-07-source-sky-x-ray.html The source of the sky's X-ray glow The sky is full of x-rays. There is a 50 year old mystery to be solved; where do all those x-rays come from?
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