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- W3021113574 abstract "We analyze two dedicated NuSTAR observations with exposure $ensuremath{sim}190text{ }text{ }mathrm{ks}$ located $ensuremath{sim}10ifmmode^circelsetextdegreefi{}$ from the Galactic plane, one above and the other below, to search for x-ray lines from the radiative decay of sterile-neutrino dark matter. These fields were chosen to minimize astrophysical x-ray backgrounds while remaining near the densest region of the dark matter halo. We find 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 context of sterile neutrinos produced via neutrino mixing, these observations provide the leading constraints in the mass range 10--12 keV, improving upon previous constraints in this range by a factor $ensuremath{sim}2$. We also compare our results to Monte Carlo simulations, showing that the fluctuations in our derived limit are not dominated by systematic effects. An updated model of the instrumental background, which is currently under development, will improve NuSTAR's sensitivity to anomalous x-ray lines, particularly for energies 3--5 keV." @default.
- W3021113574 created "2020-05-13" @default.
- W3021113574 creator A5007844250 @default.
- W3021113574 creator A5015770992 @default.
- W3021113574 creator A5027577812 @default.
- W3021113574 creator A5063948831 @default.
- W3021113574 creator A5068174431 @default.
- W3021113574 creator A5069039589 @default.
- W3021113574 creator A5074726619 @default.
- W3021113574 date "2020-05-08" @default.
- W3021113574 modified "2023-10-18" @default.
- W3021113574 title "NuSTAR tests of sterile-neutrino dark matter: New Galactic bulge observations and combined impact" @default.
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