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An unidentified 3.55 keV X-ray line in stacked spectra of galaxies andclusters raises the interesting possibility that it originates from the decayof sterile neutrino dark matter. In this work, we explore mixed sterileneutrino dark matter models that combine cold dark matter and warmer sterileneutrino dark matter produced through lepton number-driven active-to-sterileneutrino transformation. We analyze the sensitivity of the sterile neutrinospectra on active-sterile mixing and on initial neutrino lepton numbers.Furthermore, we assess the viability of these models with estimates of thenumber of subhalos formed as the host sites of satellite galaxies.

Exploring resonantly produced mixed sterile neutrino dark matter models