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We analyze two dedicated NuSTAR observations with exposure ${\sim}190$ kslocated ${\sim}10^\circ$ from the Galactic plane, one above and the otherbelow, to search for x-ray lines from the radiative decay of sterile-neutrinodark matter. These fields were chosen to minimize astrophysical x-raybackgrounds while remaining near the densest region of the dark matter halo. Wefind no evidence of anomalous x-ray lines in the energy range 5--20 keV,corresponding to sterile neutrino masses 10--40 keV. Interpreted in the contextof sterile neutrinos produced via neutrino mixing, these observations providethe leading constraints in the mass range 10--12 keV, improving upon previousconstraints in this range by a factor ${\sim}2$. We also compare our results toMonte Carlo simulations, showing that the fluctuations in our derived limit arenot dominated by systematic effects. An updated model of the instrumentalbackground, which is currently under development, will improve NuSTAR'ssensitivity to anomalous x-ray lines, particularly for energies 3--5 keV.

NuSTAR Tests of Sterile-Neutrino Dark Matter: New Galactic Bulge Observations and Combined Impact