Signs of PeVatrons in Gamma-Ray Haze
Signs of PeVatrons in Gamma-Ray Haze
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DOI：
10.1103/physics.14.41
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发表时间：
2021-04
期刊：
影响因子：
1.6
通讯作者：
P. Huentemeyer
中科院分区：
文献类型：
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作者：
P. Huentemeyer
星际介质充满了相对论性带电粒子——主要是质子和氦核。星载望远镜和地球观测站显示，这些宇宙射线的能量可能超过 1015 eV (PeV)。但是可以将粒子带到如此高能量的加速器或“PeVatrons”是什么？它们位于我们的银河系中吗？找到它们可以揭示恒星如何演化以及能量如何在银河系中传输。但尽管经过数十年的搜寻，在银河系中只找到了少数 PeVatron 候选者。中日合作的西藏 ASγ 实验报告了新的测量结果，为银河系 PeVatrons 提供了进一步的证据。实验检测到了0.1-1 PeV超高能量伽马射线的扩散发射，这很可能是由PeV宇宙射线产生的。这些的空间分布
T he interstellar medium is filled with relativistic charged particles—mostly protons and helium nuclei. Spaceborne telescopes and earthbound observatories have revealed that these cosmic rays can have energies exceeding 1015 eV (PeV). But what are the accelerators, or “PeVatrons,” that can bring particles to such high energies, and are they located in our Galaxy? Finding them could shed light on how stars evolve and on how energy is transported through the Galaxy. But despite decades of hunting, only a few PeVatron candidates have been located in the Milky Way. The Tibet ASγ experiment, a China-Japan collaboration, has reported new measurements that provide further evidence for galactic PeVatrons. The experiment has detected a diffuse emission of gamma rays with ultrahigh energies of 0.1–1 PeV, which is likely generated by PeV cosmic rays. The spatial distribution of these