Left panel: 95% confidence exclusion for sterile-neutrino DM from our analysis of the MW satellite galaxy population combined with particle collider bounds (colored shaded regions) is compared with X-ray annihilation bounds (light gray; Watson et al. 2012; Horiuchi et al. 2014; Bulbul et al. 2014; Boyarsky et al. 2014; Perez et al. 2017; Ng et al. 2019; Dessert et al. 2020) and the bounds from dwarf galaxy phase-space densities (dark gray; Alvey et al. 2021). Galaxy–halo connection and neutrino self-interaction parameters (m _ϕ and λ _ϕ ) are marginalized over. The blue–green region with solid edges corresponds to the case where we only consider the limits from invisible Z-decays on λ _ϕ . The dashed, dashed–dotted or dotted lines correspond to bounds on specific mediator flavor-coupling scenarios. DW production mechanism corresponds to the solid black line. Middle and right panels: Our sterile-neutrino DM constraints divided according to the production scenario. Case A (red) is the heavy-mediator scenario ruled out by our analysis. Case B (yellow) and Case C (blue) correspond to light-mediator scenarios.