利用LHAASO研究"超泡"内伽玛射线产生机制

宇宙线起源问题是粒子天体物理前沿重大物理问题之一，利用超高能（>10^14eV）伽玛射线寻找天体源加速PeV（>10^15eV）强子宇宙线的证据是解决这一问题的最佳手段，而位于四川省稻城县的LHAASO实验是国际上最灵敏的超高能伽玛射线探测装置。“超泡”承载了银河系超新星爆发的大部分能量，是理想的候选宇宙线加速源。本项目将基于LHAASO实验对天鹅座“超泡”的超高能伽玛射线进行测量，首次精确测量其空间形态和能谱特征，并研究其与分子云的关联，为PeV强子宇宙线加速及其传播提供重要观测证据，有望认证首个PeV强子宇宙线源。

The identification of the main contributors to the locally observed fluxes of cosmic ray is one of the main objectives for particle astrophysics. Detection of ultra-high energy gamma rays (above 10^14eV) is the best approach to solve this long-standing problem. LHAASO experiment, located at daocheng, Sichuan province, is the most sensitive detector at ultra-high energy. Superbubbles with most of the power from supernova in our Galaxy released inside are ideal candidates for galactic cosmic ray accelerators. This project will measure the ultra-high energy gamma rays from Cygnus Superbubble and give the detailed spectral and morphological analysis of the emission and its correlation with the distribution of molecular clouds, which is expected to provide the evidence for particle acceleration and propagation in superbubble and identify the first PeV cosmic ray source.