Detection of the Characteristic Pion-Decay Signature in the Molecular Clouds

18 Jan 2018  ·  Shen Zhao-Qiang, Liang Yun-Feng, Duan Kai-Kai, Li Xiang, Yuan Qiang, Fan Yi-Zhong, Wei Da-Ming ·

The $\gamma$-ray emission from molecular clouds is widely believed to have a hadronic origin, while unequivocal evidence is still lacking. In this work, we analyze the Fermi-LAT Pass 8 publicly available data accumulated from 2008 August 4 to 2017 June 29 and report the significant detection of a characteristic $\pi^0$-decay feature in the $\gamma$-ray spectra of the molecular clouds Orion A and Orion B... This detection provides a direct evidence for the hadronic origin of their $\gamma$-ray emission. read more

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High Energy Astrophysical Phenomena