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Measurement of Ultra-High-Energy Diffuse Gamma-Ray Emission of the Galactic Plane from 10 TeV to 1 PeV with LHAASO-KM2A
Cao, Zhen2,3,4; Aharonian, F.1,32; An, Q.30,31; Axikegu29; Bai, Y. X.2,4; Bao, Y. W.28; Bastieri, D.27; Bi, X. J.2,3,4; Bi, Y. J.2,4; Cai, J. T.27
SourcePHYSICAL REVIEW LETTERS
2023-10-09
Volume131Issue:15
ISSN0031-9007
DOI10.1103/PhysRevLett.131.151001
Rank第24完成单位
SubtypeArticle
English AbstractThe diffuse Galactic gamma-ray emission, mainly produced via interactions between cosmic rays and the interstellar medium and/or radiation field, is a very important probe of the distribution, propagation, and interaction of cosmic rays in the Milky Way. In this Letter, we report the measurements of diffuse gamma rays from the Galactic plane between 10 TeV and 1 PeV energies, with the square kilometer array of the Large High Altitude Air Shower Observatory (LHAASO). Diffuse emissions from the inner (15 degrees< l < 125 degrees, |b| < 5 degrees) and outer (125 degrees < l < 235 degrees, |b| < 5 degrees) Galactic plane are detected with 29.1 sigma and 12.7 sigma significance, respectively. The outer Galactic plane diffuse emission is detected for the first time in the very- to ultra-high-energy domain (E > 10 TeV). The energy spectrum in the inner Galaxy regions can be described by a power-law function with an index of -2.99 +/- 0.04, which is different from the curved spectrum as expected from hadronic interactions between locally measured cosmic rays and the line-of-sight integrated gas content. Furthermore, the measured flux is higher by a factor of similar to 3 than the prediction. A similar spectrum with an index of -2.99 +/- 0.07 is found in the outer Galaxy region, and the absolute flux for 10 less than or similar to E less than or similar to 60 TeV is again higher than the prediction for hadronic cosmic ray interactions. The latitude distributions of the diffuse emission are consistent with the gas distribution, while the longitude distributions show clear deviation from the gas distribution. The LHAASO measurements imply that either additional emission sources exist or cosmic ray intensities have spatial variations.
Subject天文学
URL查看原文
Publish PlaceONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Funding ProjectChengdu Management Committee of Tianfu New Area; National Key RAMP;D program of China[2018YFA0404202]; National Key RAMP;D program of China[2018YFA0404201]; National Key RAMP;D program of China[2018YFA0404203]; National Key RAMP;D program of China[2018YFA0404204]; National Natural Science Foundation of China[12220101003]; National Natural Science Foundation of China[12321003]; National Natural Science Foundation of China[12322302]; National Natural Science Foundation of China[12273114]; National Natural Science Foundation of China[12022502]; National Natural Science Foundation of China[12205314]; National Natural Science Foundation of China[12105301]; National Natural Science Foundation of China[12261160362]; National Natural Science Foundation of China[12105294]; National Natural Science Foundation of China[U1931201]; Project for Young Scientists in Basic Research of Chinese Academy of Sciences[YSBR-061]; Program for Innovative Talents and Entrepreneur in Jiangsu; National Science, Research and Innovation Fund (NSRF) of Thailand via the Program Management Unit for Human Resources AMP; Institutional Development, Research and Innovation[B37G660015]
WOS KeywordDISCOVERY ; SPECTRA ; ORIGIN ; PROTON
WOS Research AreaPhysics
Language英语
PublisherAMER PHYSICAL SOC
WOS IDWOS:001102985000003
Funding OrganizationChengdu Management Committee of Tianfu New Area ; National Key RAMP ; D program of China[2018YFA0404202, 2018YFA0404201, 2018YFA0404203, 2018YFA0404204] ; National Natural Science Foundation of China[12220101003, 12321003, 12322302, 12273114, 12022502, 12205314, 12105301, 12261160362, 12105294, U1931201] ; Project for Young Scientists in Basic Research of Chinese Academy of Sciences[YSBR-061] ; Program for Innovative Talents and Entrepreneur in Jiangsu ; National Science, Research and Innovation Fund (NSRF) of Thailand via the Program Management Unit for Human Resources AMP ; Institutional Development, Research and Innovation[B37G660015]
Content Type期刊论文
Version出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/26543]  
Collection云南天文台_高能天体物理研究组
Affiliation1.Dublin Institute for Advanced Studies, 31 Fitzwilliam Place, 2 Dublin, Ireland;
2.Tianfu Cosmic Ray Research Center, 610000 Chengdu, Sichuan, China;
3.University of Chinese Academy of Sciences, 100049 Beijing, China;
4.Key Laboratory of Particle Astrophyics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, 100049 Beijing, China;
5.National Space Science Center, Chinese Academy of Sciences, 100190 Beijing, China
6.Center for Relativistic Astrophysics and High Energy Physics, School of Physics and Materials Science & Institute of Space Science and Technology, Nanchang University, 330031 Nanchang, Jiangxi, China;
7.Moscow Institute of Physics and Technology, 141700 Moscow, Russia;
8.Department of Physics, Faculty of Science, Mahidol University, 10400 Bangkok, Thailand;
9.School of Physical Science and Technology, Guangxi University, 530004 Nanning, Guangxi, China;
10.School of Physics, Peking University, 100871 Beijing, China;
Recommended Citation
GB/T 7714
Cao, Zhen,Aharonian, F.,An, Q.,et al. Measurement of Ultra-High-Energy Diffuse Gamma-Ray Emission of the Galactic Plane from 10 TeV to 1 PeV with LHAASO-KM2A[J]. PHYSICAL REVIEW LETTERS,2023,131(15).
APA Cao, Zhen.,Aharonian, F..,An, Q..,Axikegu.,Bai, Y. X..,...&Zuo, X..(2023).Measurement of Ultra-High-Energy Diffuse Gamma-Ray Emission of the Galactic Plane from 10 TeV to 1 PeV with LHAASO-KM2A.PHYSICAL REVIEW LETTERS,131(15).
MLA Cao, Zhen,et al."Measurement of Ultra-High-Energy Diffuse Gamma-Ray Emission of the Galactic Plane from 10 TeV to 1 PeV with LHAASO-KM2A".PHYSICAL REVIEW LETTERS 131.15(2023).
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