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Dark matter particles with a mass around 1 eV can decay into near-infraredphotons. Utilising available public blank sky observations from the NIRSpec IFUon the James Webb Space Telescope (JWST), we search for a narrow emission linedue to decaying dark matter and derive leading constraints in the mass range0.8-3 eV on the decay rate to photons, and more specifically, on theaxion-photon coupling for the case of axion-like particles. We exclude $\tau <6.7\cdot 10^{26}$ s at $m_{\rm DM} \simeq 0.9$ eV and, in the case of axions,$g_{a \gamma \gamma} > 9.4 \cdot 10^{-12}$ GeV$^{-1}$ for $m_a = 2.15$ eV. Ourresults do not rely on dedicated observations, rather we use blank skyobservations intended for sky subtraction, and thus our reach may beautomatically strengthened as JWST continues to observe.

Hunting Dark Matter Lines in the Infrared Background with the James Webb Space Telescope