首次探测到来自银盘的亚 PeV 弥漫伽马射线：能量超过 PeV 的普遍存在的银河宇宙射线的证据。

First Detection of sub-PeV Diffuse Gamma Rays from the Galactic Disk: Evidence for Ubiquitous Galactic Cosmic Rays beyond PeV Energies.

作者信息

Amenomori M, Bao Y W, Bi X J, Chen D, Chen T L, Chen W Y, Chen Xu, Chen Y, Cui S W, Ding L K, Fang J H, Fang K, Feng C F, Feng Zhaoyang, Feng Z Y, Gao Qi, Gou Q B, Guo Y Q, Guo Y Y, He H H, He Z T, Hibino K, Hotta N, Hu Haibing, Hu H B, Huang J, Jia H Y, Jiang L, Jin H B, Kasahara K, Katayose Y, Kato C, Kato S, Kawata K, Kihara W, Ko Y, Kozai M, Le G M, Li A F, Li H J, Li W J, Lin Y H, Liu B, Liu C, Liu J S, Liu M Y, Liu W, Lou Y-Q, Lu H, Meng X R, Munakata K, Nakada H, Nakamura Y, Nanjo H, Nishizawa M, Ohnishi M, Ohura T, Ozawa S, Qian X L, Qu X B, Saito T, Sakata M, Sako T K, Shao J, Shibata M, Shiomi A, Sugimoto H, Takano W, Takita M, Tan Y H, Tateyama N, Torii S, Tsuchiya H, Udo S, Wang H, Wu H R, Xue L, Yamamoto Y, Yang Z, Yokoe Y, Yuan A F, Zhai L M, Zhang H M, Zhang J L, Zhang X, Zhang X Y, Zhang Y, Zhang Yi, Zhang Ying, Zhao S P, Zhou X X

机构信息

Department of Physics, Hirosaki University, Hirosaki 036-8561, Japan.

School of Astronomy and Space Science, Nanjing University, Nanjing 210093, China.

出版信息

Phys Rev Lett. 2021 Apr 9;126(14):141101. doi: 10.1103/PhysRevLett.126.141101.

DOI:10.1103/PhysRevLett.126.141101

PMID:33891464

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 π^{0}'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.

摘要

我们首次报告了在银河系盘中探测到能量介于100 TeV和1 PeV之间的弥漫伽马射线，这是人们期待已久的。特别地，除了已知的TeV伽马射线源外，还观测到了所有能量高于398 TeV的伽马射线，这些伽马射线与强子发射模型的预期相符，在该模型中，伽马射线源自质子与银河系星际介质相互作用产生的π⁰介子的衰变。这有力地证明了宇宙射线在我们的银河系中被加速到超过PeV能量，并在银河系盘中扩散。