Cygnus X-3 produces variable gamma rays up to 3.7 PeV, consistent with photomeson production in its relativistic jet requiring protons accelerated to tens of PeV.
Galactic Superaccret- ing X-Ray Binaries as Super-PeVatron Accelerators.ApJL 2025;989:L25
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Cygnus X-3: A variable petaelectronvolt gamma-ray source
Cygnus X-3 produces variable gamma rays up to 3.7 PeV, consistent with photomeson production in its relativistic jet requiring protons accelerated to tens of PeV.