Ultra-high-energy Gamma-Ray Radiation from the Crab Pulsar Wind Nebula

Abstract It has been long debated whether the high-energy gamma-ray radiation from Crab Nebula stems leptonic or hadronic processes. In this work, we investigate multiband nonthermal pulsar wind nebula with and leptonic–hadronic hybrid models, respectively. Then use Markov Chain Monte Carlo sampling technology method of trace to study stability reasonability model parameters according recently observed results obtain best-fitting values parameters. Finally, calculate different radiative components generated by electrons protons in Nebula. The modeling indicate that pure origin one-zone only can partly agree some segments data various experiments (including PeV emission reported LHAASO other ranging radio very-high-energy wave band), contribution interaction is hardly constrained. However, find process may also contribute, especially energy range exceeding PeV. addition, it be inferred higher signals could future.