First Detection of sub-PeV Diffuse Gamma Rays from the Galactic Disk: Evidence for Ubiquitous Galactic Cosmic Rays beyond PeV Energies
High Energy Astrophysical Phenomena
2021-05-18 v2
Abstract
We report, for the first time, the long-awaited detection of diffuse gamma rays with energies between 100 TeV and 1 PeV in the Galactic disk. Particularly, all gamma rays above 398 TeV are observed apart from known TeV gamma-ray sources and compatible with expectations from the hadronic emission scenario in which gamma rays originate from the decay of 's produced through the interaction of protons with the interstellar medium in the Galaxy. This is strong evidence that cosmic rays are accelerated beyond PeV energies in our Galaxy and spread over the Galactic disk.
Cite
@article{arxiv.2104.05181,
title = {First Detection of sub-PeV Diffuse Gamma Rays from the Galactic Disk: Evidence for Ubiquitous Galactic Cosmic Rays beyond PeV Energies},
author = {M. Amenomori and Y. W. Bao and X. J. Bi and D. Chen and T. L. Chen and W. Y. Chen and Xu Chen and Y. Chen and Cirennima and S. W. Cui and Danzengluobu and L. K. Ding and J. H. Fang and K. Fang and C. F. Feng and Zhaoyang Feng and Z. Y. Feng and Qi Gao and Q. B. Gou and Y. Q. Guo and Y. Y. Guo and H. H. He and Z. T. He and K. Hibino and N. Hotta and Haibing Hu and H. B. Hu and J. Huang and H. Y. Jia and L. Jiang and H. B. Jin and K. Kasahara and Y. Katayose and C. Kato and S. Kato and K. Kawata and W. Kihara and Y. Ko and M. Kozai and Labaciren and G. M. Le and A. F. Li and H. J. Li and W. J. Li and Y. H. Lin and B. Liu and C. Liu and J. S. Liu and M. Y. Liu and W. Liu and Y. -Q. Lou and H. Lu and X. R. Meng and K. Munakata and H. Nakada and Y. Nakamura and H. Nanjo and M. Nishizawa and M. Ohnishi and T. Ohura and S. Ozawa and X. L. Qian and X. B. Qu and T. Saito and M. Sakata and T. K. Sako and J. Shao and M. Shibata and A. Shiomi and H. Sugimoto and W. Takano and M. Takita and Y. H. Tan and N. Tateyama and S. Torii and H. Tsuchiya and S. Udo and H. Wang and H. R. Wu and L. Xue and Y. Yamamoto and Z. Yang and Y. Yokoe and A. F. Yuan and L. M. Zhai and H. M. Zhang and J. L. Zhang and X. Zhang and X. Y. Zhang and Y. Zhang and Yi Zhang and Ying Zhang and S. P. Zhao and Zhaxisangzhu and X. X. Zhou},
journal= {arXiv preprint arXiv:2104.05181},
year = {2021}
}
Comments
Accepted for publication in the Physical Review Letters