TL;DR
This study searches for axions emitted by super star clusters using X-ray data, constraining the axion-photon coupling strength but finding no evidence of axions.
Contribution
It introduces a novel method of using Galactic magnetic field models and archival X-ray data to search for axions from specific stellar clusters.
Findings
No significant axion signal detected
Constraints on axion-photon coupling strength
Limits set for axion masses below 5×10^{-11} eV
Abstract
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 GeV for masses eV at 95\% confidence.
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