Direct X-ray Constraints on Sterile Neutrino Warm Dark Matter

  title={Direct X-ray Constraints on Sterile Neutrino Warm Dark Matter},
  author={Casey R. Watson and John F. Beacom and Hasan Yuksel and Terry P. Walker},
  journal={Physical Review D},
Warm dark matter (WDM) might more easily account for small scale clustering measurements than the heavier particles typically invoked incold dark matter (�CDM) cosmologies. In this paper, we consider aWDM cosmology in which sterile neutrinoss, with a mass ms of roughly 1-100 keV, are the dark matter. We use the diffuse X-ray spectrum (total minus resolved point source emission) of the Andromeda galaxy to constrain the rate of sterile neutrino radiative decay: �s → �e,µ,� + . Our findings demand… 

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