We report the analysis of the Fermi-Large Area Telescope data from six nearby giant molecular clouds (MCs) belonging to the Gould Belt and the Aquila Rift regions. The high statistical γ -ray spectra above 3 GeV well described by power laws make it possible to derive precise estimates of the cosmic-ray (CR) distribution in the MCs. The comparison of γ -ray spectra of Taurus, Orion A, and Orion B clouds with the model expected from Alpha Magnetic Spectrometer (AMS-02) CR measurements confirms these clouds as passive clouds, immersed in an AMS-02-like CR spectrum. A similar comparison of Aquila Rift, Rho Oph, and Cepheus spectra yields significant deviation in both spectral indices and absolute fluxes, which can imply an additional acceleration of CRs throughout the entire clouds. Besides, the theoretical modeling of the excess γ -ray spectrum of these clouds, assuming π 0 -decay interaction of CRs in the cloud, gives a considerable amount of an ...

中文翻译：

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来自局部巨型分子云的宇宙射线过量的证据

我们报告了来自古尔德带和天鹰座裂谷地区的六个附近巨型分子云（MC）的费米大面积望远镜数据的分析。幂定律很好地描述了高于3 GeV的高统计γ射线光谱，从而有可能得出MC中宇宙射线（CR）分布的精确估计。将金牛座，猎户座A和猎户座B云的γ射线光谱与Alpha电磁光谱仪（AMS-02）CR测量所期望的模型进行比较，证实了这些云为被动云，并沉浸在类似AMS-02的CR光谱中。对天鹰座裂谷，Rho Oph和Cepheus光谱进行的类似比较会在光谱指数和绝对通量方面产生明显的偏差，这可能意味着CR会在整个云中进一步加速。除了，