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We provide a comprehensive study of observable spectra from dark matterpair-annihilation or decay into sterile (right-handed) neutrinos. This occurs,for instance, in neutrino portal dark matter models, where a sterile neutrinoacts as the portal between dark matter and the Standard Model sector. Thesubsequent decays of right-handed neutrinos produce detectable Standard Modelparticles, notably photons, positrons, and neutrinos. We study thephenomenology of models where the right-handed neutrino masses are below theGeV scale, as well as models where they are at, or significantly heavier than,the TeV scale. In both instances, and for different reasons, the standardtools, including Monte Carlo simulations, are both inadequate and inaccurate.We present the complete framework to compute the relevant branching ratios forright-handed neutrino decays and the spectra of secondary photons, positrons,and neutrinos for a broad range of dark matter and right-handed neutrinomasses. We discuss the general features of such signals, and compare thespectra to standard signals from dark matter annihilation/decay into bottomquarks. Additionally, we provide open source code1 that can be used to computesuch spectra. The code is available athttps://github.com/LoganAMorrison/blackthorn.

Sterile Neutrinos from Dark Matter: A $\nu$ Nightmare?