Core galactic profiles Blow Away

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An unidentified line in X-ray signal around 3.5 keV.
At the same time it verified the model that explains the distortion of X-rays emitted from a black hole.
This signal is coming from different galaxy cluster and several scenarios of dark matter can justify such a line. We can cite for example a 3.5 keV candidate annihilating into 2 photons or a 7 keV dark matter particle decaying into photon and neutrino Although for individual objects it is hard to exclude the possibility that the feature is due to an instrumental effect or an atomic line of anomalous brightness dark matter candidates that might produce this kind of line include axions.


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