Measurement of Ultra-High-Energy Diffuse Gamma-Ray Emission of the Galactic Plane from 10 TeV to 1 PeV with LHAASO-KM2A

doi:10.1103/PhysRevLett.131.151001

	Measurement of Ultra-High-Energy Diffuse Gamma-Ray Emission of the Galactic Plane from 10 TeV to 1 PeV with LHAASO-KM2A
	Cao, Zhen 2,3,4; Aharonian, F.1,32; An, Q.30,31; Axikegu 29; 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
刊名	PHYSICAL REVIEW LETTERS
	2023-10-09
卷号	131 期号:15
ISSN号	0031-9007
DOI	10.1103/PhysRevLett.131.151001
产权排序	第24完成单位
文献子类	Article
英文摘要	The 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.
学科主题	天文学
URL标识	查看原文
出版地	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
资助项目	Chengdu 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关键词	DISCOVERY ; SPECTRA ; ORIGIN ; PROTON
WOS研究方向	Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:001102985000003
资助机构	Chengdu 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]
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ynao.ac.cn/handle/114a53/26543]
专题	云南天文台_高能天体物理研究组
作者单位	1.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;
推荐引用方式 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).