由超拍电子伏特加速器产生的超高能伽马射线气泡  

An ultrahigh-energyγ-ray bubble powered by a super PeVatron

作　　者：LHAASO Collaboration Zhen Cao Chuandong Gao Cong Li Ruo-Yu Liu Ruizhi Yang 

机构地区：[1]不详 [2]Key Laboratory of Particle Astrophyics&Experimental Physics Division&Computing Center,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]TIANFU Cosmic Ray Research Center,Chengdu,China [5]Institute of Frontier and Interdisciplinary Science,Shandong University,Qingdao 266237,China [6]School of Astronomy and Space Science,Nanjing University,Nanjing 210023,China [7]University of Science and Technology of China,Hefei 230026,China

出　　处：《Science Bulletin》2024年第4期449-457,共9页科学通报（英文版）

基　　金：supported in China by the National Key R&D Program of China(2018YFA0404201,2018YFA0404202,2018YFA0404203,and 2018YFA0404204);the National Natural Science Foundation of China(12105294,12022502,12261160362,12205314,U1931201,and U2031105);the Youth Innovation Promotion Association of Chinese Academy of Sciences(2022010);in Thailand by the National Science and Technology Development Agency(NSTDA)and National Research Council of Thailand(NRCT):High-Potential Research Team Grant Program(N42A650868).

摘　　要：We report the detection of aγ-ray bubble spanning at least 100deg2 in ultra-high energy(UHE)up to a few PeV in the direction of the star-forming region Cygnus X,implying the presence super PeVatron(s)accelerating protons to at least 10 PeV.A log-parabola form with the photon indexΓ(E)=(2.71±0.02)+(0.11±0.02)×log10(E/10 TeV)is found fitting the gamma-ray energy spectrum of the bubble well.UHE sources,“hot spots”correlated with very massive molecular clouds,and a quasi-spherical amorphousγ-ray emitter with a sharp central brightening are observed in the bubble.In the core of~0.5°,spatially associating with a region containing massive OB association(Cygnus OB2)and a microquasar(Cygnus X-3),as well as previously reported multi-TeV sources,an enhanced concentration of UHEγ-rays is observed with 2 photons at energies above 1 PeV.The general feature of the bubble,the morphology,and the energy spectrum,are reasonably reproduced by the assumption of a particle accelerator in the core,continuously injecting protons into the ambient medium.

关 键 词：Cosmic rays γ-rays Interstellar medium Star cluster 

分 类 号：P14[天文地球—天体物理]