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X-ray Searches for Axions from Super Star Clusters
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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 $g_{a\gamma\gamma} \lesssim 3.6 \times 10^{-12}$ GeV$^{-1}$ for masses $m_a \lesssim 5 \times 10^{-11}$ eV at 95\% confidence.
Forward citations
Cited by 8 Pith papers
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Axiverse Lampposts
In a hierarchical multi-axion theory with random couplings, axion field ranges shrink with 1/sqrt(N), generic axion–SM couplings are suppressed, but the QCD axion's coupling is unsuppressed.
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Search for Axions in Magnetic White Dwarf Polarization at Lick and Keck Observatories
Dedicated Lick and Keck spectropolarimetry of magnetic white dwarfs finds no axion-induced linear polarization and sets |g_aγγ| < 1.7e-12 GeV^-1 at 95% CL for m_a < 2e-7 eV.
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Forecast constraints on the axion-photon coupling from interstellar medium heating
Axion dark matter resonantly heats interstellar plasma when its mass matches the plasma frequency, yielding forecast upper limits on the axion-photon coupling g as strong as about 2e-14 GeV^-1 for a 1 microgauss field.
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Time-delayed gamma-ray signatures of heavy axions from core-collapse supernovae
No gamma-ray excess from four supernovae in Fermi-LAT data yields the strongest constraints yet on MeV-to-GeV heavy axions coupled to both QED and QCD.
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Reappraisal of the Constraints on Heavy Axion-like Particles from Gamma-Ray Bursts
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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Probing Heavy Axion-like Particles from Massive Stars with X-rays and Gamma Rays
Decay photons from heavy ALPs produced in Wolf-Rayet stars can be probed by INTEGRAL SPI down to gaγ ~ 4e-11 GeV^-1 for ma ~ 10-100 keV, modestly extending existing limits.
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Circular polarization effects induced by photon-axion mixing in astrophysical environments
The paper derives analytic circular-polarization signals from photon-axion mixing and uses the blazar S4 0954+65 optical circular-polarization limit to bound g_aγγ around 10^-12 to 10^-11 GeV^-1 for ultralight axion masses.
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Fresh look at the diffuse ALP background from supernovae
Adding pion conversion to the diffuse supernova ALP background tightens the Fermi-LAT bound on the ALP-photon coupling to about 2e-13 GeV^-1 for ultralight ALPs, and SN 1987A remains roughly ten times stronger.
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