NuSTAR tests of sterile-neutrino dark matter: New Galactic bulge observations and combined impact
Abstract
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.
- Authors:
-
[1];
[2];
[1];
[3];
[4];
[5];
[6]
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Weizmann Inst. of Science, Rehovot (Israel)
- 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)
- Publication Date:
- Research Org.:
- Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Aeronautics and Space Administration (NASA); Alfred P. Sloan Foundation; National Science Foundation (NSF); Russian Science Foundation (RSF)
- OSTI Identifier:
- 1803360
- Grant/Contract Number:
- SC0018327; 80NSSC18K1615; 25928; PHY-1714479; AST-1908960; PHY-1914409; 19-12-00396; 80NSSC18K0686
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. D.
- Additional Journal Information:
- Journal Volume: 101; Journal Issue: 10; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics; Physics
Citation Formats
Roach, Brandon M., Ng, Kenny C. Y., Perez, Kerstin, Beacom, John F., Horiuchi, Shunsaku, Krivonos, Roman, and Wik, Daniel R. NuSTAR tests of sterile-neutrino dark matter: New Galactic bulge observations and combined impact. United States: N. p., 2020.
Web. doi:10.1103/physrevd.101.103011.
Roach, Brandon M., Ng, Kenny C. Y., Perez, Kerstin, Beacom, John F., Horiuchi, Shunsaku, Krivonos, Roman, & Wik, Daniel R. NuSTAR tests of sterile-neutrino dark matter: New Galactic bulge observations and combined impact. United States. https://doi.org/10.1103/physrevd.101.103011
Roach, Brandon M., Ng, Kenny C. Y., Perez, Kerstin, Beacom, John F., Horiuchi, Shunsaku, Krivonos, Roman, and Wik, Daniel R. Fri .
"NuSTAR tests of sterile-neutrino dark matter: New Galactic bulge observations and combined impact". United States. https://doi.org/10.1103/physrevd.101.103011. https://www.osti.gov/servlets/purl/1803360.
@article{osti_1803360,
title = {NuSTAR tests of sterile-neutrino dark matter: New Galactic bulge observations and combined impact},
author = {Roach, Brandon M. and Ng, Kenny C. Y. and Perez, Kerstin and Beacom, John F. and Horiuchi, Shunsaku and Krivonos, Roman and Wik, Daniel R.},
abstractNote = {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.},
doi = {10.1103/physrevd.101.103011},
journal = {Physical Review. D.},
number = 10,
volume = 101,
place = {United States},
year = {Fri May 08 00:00:00 EDT 2020},
month = {Fri May 08 00:00:00 EDT 2020}
}
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