NuSTAR tests of sterile-neutrino dark matter: New Galactic bulge observations and combined impact

Roach, Brandon M.; Ng, Kenny C. Y.; Perez, Kerstin; Beacom, John F.; Horiuchi, Shunsaku; Krivonos, Roman; Wik, Daniel R.

doi:10.1103/physrevd.101.103011

NuSTAR tests of sterile-neutrino dark matter: New Galactic bulge observations and combined impact

Journal Article · Fri May 08 00:00:00 EDT 2020 · Physical Review. D.

DOI:https://doi.org/10.1103/physrevd.101.103011· OSTI ID:1803360

^[1]; ^[2]; ^[3]; ^[4]; ^[5]; ^[6]; ^[7]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); OSTI
Weizmann Inst. of Science, Rehovot (Israel)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
The Ohio State Univ., Columbus, OH (United States)
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Russian Academy of Sciences (RAS), Moscow (Russia)
Univ. of Utah, Salt Lake City, UT (United States)

In this work, 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.

View Accepted Manuscript (DOE)

Research Organization:: Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

Sponsoring Organization:: Alfred P. Sloan Foundation; National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); Russian Science Foundation (RSF); USDOE Office of Science (SC)

Grant/Contract Number:: SC0018327

OSTI ID:: 1803360

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 10 Vol. 101; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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