NuSTAR tests of sterile-neutrino dark matter: New Galactic bulge observations and combined impact
Name
PhysRevD.101.103011.pdf
Description
Published version
Size
829.51 KB
Format
Adobe PDF
Checksum (MD5)
9879bd2c8bff707fa212c37f340aa3d6
Author(s)
Roach, Brandon M
Ng, Kenny CY
Perez, Kerstin
Beacom, John F
Horiuchi, Shunsaku
Krivonos, Roman
Wik, Daniel R
Date Issued
2020
Journal
Physical Review D
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
© 2020 American Physical Society. © 2020 American Physical Society. We analyze two dedicated NuSTAR observations with exposure ∼190 ks located ∼10° 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 ∼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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PHYSREVD.101.103011
