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NuSTAR as an Axion Helioscope
J Ruz1,2, E Todarello3,4,5, J K Vogel1,2
1Technische Universität Dortmund, Fakultät für Physik, Dortmund, D-44221, Germany.
Abstract:
We present a novel approach to investigating axions and axionlike particles by studying their potential conversion into x-rays within the Sun's atmospheric magnetic field. Utilizing high-sensitivity data from the nuclear spectroscopic telescope array (NuSTAR) collected during the 2020 solar minimum, along with advanced solar atmospheric magnetic field models, we establish a new limit on the axion-photon coupling strength g_{aγ}≲7.3×10^{-12} GeV^{-1} at 95% CL for axion masses m_{a}≲4×10^{-7} eV. This constraint surpasses current ground-based experimental limits, studying previously unexplored regions of the axion-photon coupling parameter space up to masses of m_{a}≲3.4×10^{-4} eV. These findings mark a significant advancement in our ability to probe axion properties and strengthen indirect searches for dark matter candidates.
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