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New bounds on axion-like particles in the ultraviolet from legacy data
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DOI：10.1088/1475-7516/2026/04/063.png)
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Abstract
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We use legacy data from the Hubble Space Telescope (HST) and the International Ultraviolet Explorer (IUE) to search for a spectral line from the spontaneous decay of axion-like particle (ALP) dark matter. The HST data consist of blank sky observations taken with the Faint Object Spectrograph in the 165–240 nm wavelength range, while the IUE data consist of observations of the Virgo Cluster obtained with the long- and short-wavelength spectrographs, covering 195–325 nm and 123–200 nm, respectively. We set a 95% C.L. upper limit on the ALP-photon coupling gaγ ≲ 10-11 GeV-1 across the whole probed ALP mass range. Notably, we rule out values of gaγ above 2.3 × 10-12 GeV-1 for ALP masses between 12.4 and 14.5 eV, improving upon previous limits by a factor of seven.
Keywords:
axion-like particles
dark matter
Hubble Space Telescope
International Ultraviolet Explorer
ALP-photon coupling
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