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Title: Dark matter line emission constraints from NuSTAR observations of the bullet cluster

Some dark matter candidates, e.g., sterile neutrinos, provide observable signatures in the form of mono-energetic line emission. Here, we present the first search for dark matter line emission in the $$3-80\;\mathrm{keV}$$ range in a pointed observation of the Bullet Cluster with NuSTAR. We do not detect any significant line emission and instead we derive upper limits (95% CL) on the flux, and interpret these constraints in the context of sterile neutrinos and more generic dark matter candidates. NuSTAR does not have the sensitivity to constrain the recently claimed line detection at $$3.5\;\mathrm{keV}$$, but improves on the constraints for energies of $$10-25\;\mathrm{keV}$$.
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [5] ;  [2] ;  [9]
  1. Univ. of Oslo, Oslo (Norway)
  2. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. INAF, IASF Milano, Milano (Italy)
  5. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  6. Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  7. Columbia Univ., New York, NY (United States)
  8. Univ. of California, Berkeley, CA (United States)
  9. Technical Univ. of Denmark, Lyngby (Denmark)
Publication Date:
Report Number(s):
Journal ID: ISSN 1538-4357
Grant/Contract Number:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 810; Journal Issue: 1; Journal ID: ISSN 1538-4357
Institute of Physics (IOP)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
Country of Publication:
United States
79 ASTRONOMY AND ASTROPHYSICS; dark matter; line: identification; X-rays: galaxies: clusters
OSTI Identifier: