蟹状星云（Crab Nebula）随能量变化的延展性作为超高能强子辐射的诊断依据

蟹状星云在X射线和TeV波段之间表现出的能量依赖性延展与轻子模型预期不符，这可以通过空间分辨的轻子-强子模型得到解释。该研究指出，在PeV能量下，蟹状星云的辐射几乎完全由强子过程主导，这种延展性特征为识别脉冲星风（pulsar wind）星云中超高能伽马射线的起源提供了关键诊断手段。

arXiv:2608.25497v1 Announce Type: new Abstract: The energy-dependent apparent extension of the Crab Nebula, inconsistent with leptonic expectations between X-ray and TeV bands, can be naturally accounted for in a spatially resolved lepto-hadronic scenario. A transition to hadronic dominance occurs above $\sim400~\rm{TeV}$, with nearly pure hadronic emission at PeV energies. The predicted $68\%$ containment radius at $1.1~\rm{PeV}$ is $\sim1.4'$, about six times larger than in purely leptonic scenarios. This energy-dependent extension therefore provides an observable discriminator of the origin of ultra-high-energy gamma-ray emission in pulsar wind nebulae, offering a diagnostic of PeV hadronic acceleration in the Crab Nebula.