An Ultrahigh-energy $\gamma$-ray Bubble Powered by a Super PeVatron

The LHAASO Collaboration, Z. Cao, F. Aharonian +277

We report the detection of a $\gamma$-ray bubble spanning at least 100$\mathrm{de}{\mathrm{g}}^2$ in ultra high energy (UHE) up to a few PeV in the direction of the star-forming region Cygnus X, implyi…