Overview
- The observatory reported ultra-high-energy gamma rays from SS 433, V4641 Sgr, GRS 1915+105, MAXI J1820+070, and Cygnus X-1.
- In SS 433, emission overlapping a giant atomic cloud indicates black-hole-accelerated protons above 1 PeV with a power near 10^32 joules per second.
- V4641 Sgr produced gamma rays up to 0.8 PeV, implying parent particles exceeding 10 PeV and identifying it as a super-PeV accelerator.
- Using multi-parameter selection, LHAASO isolated a high-purity proton sample and measured a spectrum that reveals an unexpected high-energy component near the knee.
- Synthesizing these results with AMS-02 and DAMPE data points to multiple Galactic accelerator classes, with the knee marking the energy limit of sources powered by black hole jets.