RXTE data on galaxy clusters shows a 2.5σ excess at 3.55 keV that correlates with cluster temperature and could partly be from sterile neutrino decay.
Radiative efficiency, variability and Bondi accretion on to massive black holes: The transition from radio AGN to quasars in brightest cluster galaxies
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An RXTE Search for the Sterile Neutrino Decay in Galaxy Clusters
RXTE data on galaxy clusters shows a 2.5σ excess at 3.55 keV that correlates with cluster temperature and could partly be from sterile neutrino decay.