中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Measurement of Ultra-High-Energy Diffuse Gamma-Ray Emission of the Galactic Plane from 10 TeV to 1 PeV with LHAASO-KM2A

文献类型:期刊论文

AuthorCao, Zhen4,5,6; Aharonian, F.2,3; An, Q.7,32; Axikegu8; Bai, Y. X.4,6; Bao, Y. W.9; Bastieri, D.10; Bi, X. J.4,5,6; Bi, Y. J.4,6; Cai, J. T.10
SourcePHYSICAL REVIEW LETTERS
Issued Date2023-10-09
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
WOS KeywordDISCOVERY ; SPECTRA ; ORIGIN ; PROTON
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 Research AreaPhysics
Language英语
WOS IDWOS:001102985000003
PublisherAMER PHYSICAL SOC
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]