http://arxiv.org/abs/1801.06075
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.
Z. Shen, Y. Liang, K. Duan, et. al.
Fri, 19 Jan 18
50/68
Comments: 11 pages, 5 figures and 1 table