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X-ray Searches for Axions from Super Star Clusters
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Axions may be produced in abundance inside stellar cores and then convert into observable X-rays in the Galactic magnetic fields. We focus on the Quintuplet and Westerlund 1 super star clusters, which host large numbers of hot, young stars including Wolf-Rayet stars; these stars produce axions efficiently through the axion-photon coupling. We use Galactic magnetic field models to calculate the expected X-ray flux locally from axions emitted from these clusters. We then combine the axion model predictions with archival Nuclear Spectroscopic Telescope Array (NuSTAR) data from 10 - 80 keV to search for evidence of axions. We find no significant evidence for axions and constrain the axion-photon coupling $g_{a\gamma\gamma} \lesssim 3.6 \times 10^{-12}$ GeV$^{-1}$ for masses $m_a \lesssim 5 \times 10^{-11}$ eV at 95\% confidence.
Forward citations
Cited by 6 Pith papers
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Bounds on massive graviton-like particles from searches for axion-like particles coupling to photons
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Realistic GRB parameters weaken previous ALP cooling bounds, but ALP-induced secondary fireballs in GRBs could still be probed via isotropic X-ray emission from future telescopes.
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Circular polarization effects induced by photon-axion mixing in astrophysical environments
Photon-axion mixing in magnetic fields induces circular polarization that constrains the axion-photon coupling to g_aγγ ≤ 5×10^{-12} GeV^{-1} for m_a ~10^{-16}--10^{-10} eV using blazar data, with peak sensitivity in ...
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