Papers › X-ray Searches for Axions from Super Star Clusters

X-ray Searches for Axions from Super Star Clusters

7 Aug 2020arXiv:2008.03305links table onlyarchive 2025-07-28

Christopher Dessert, Joshua W. Foster, Benjamin R. Safdi

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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 gₐᵧᵧ ≲3.6 ×10⁻¹² GeV⁻¹ for masses mₐ ≲5 ×10⁻¹¹ eV at 95% confidence.

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