First Detection of Ultrahigh Energy Emission from Gamma-Ray Binary LS I +61° 303

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dc.contributor.authorCao Z.
dc.contributor.authorAharonian F.
dc.contributor.authorBai Y.X.
dc.contributor.authorBao Y.W.
dc.contributor.authorBastieri D.
dc.contributor.authorBi X.J.
dc.contributor.authorBi Y.J.
dc.contributor.authorBian W.
dc.contributor.authorBukevich A.V.
dc.contributor.authorCai C.M.
dc.contributor.authorCao W.Y.
dc.contributor.authorCao Z.
dc.contributor.authorChang J.
dc.contributor.authorChang J.F.
dc.contributor.authorChen A.M.
dc.contributor.authorChen E.S.
dc.contributor.authorChen G.H.
dc.contributor.authorChen H.X.
dc.contributor.authorChen L.
dc.contributor.authorChen L.
dc.contributor.authorChen M.J.
dc.contributor.authorChen M.L.
dc.contributor.authorChen Q.H.
dc.contributor.authorChen S.
dc.contributor.authorChen S.H.
dc.contributor.authorChen S.Z.
dc.contributor.authorChen T.L.
dc.contributor.authorChen X.B.
dc.contributor.authorChen X.J.
dc.contributor.authorChen Y.
dc.contributor.authorCheng N.
dc.contributor.authorCheng Y.D.
dc.contributor.authorChu M.C.
dc.contributor.authorCui M.Y.
dc.contributor.authorCui S.W.
dc.contributor.authorCui X.H.
dc.contributor.authorCui Y.D.
dc.contributor.authorDai B.Z.
dc.contributor.authorDai H.L.
dc.contributor.authorDai Z.G.
dc.contributor.authorDanzengluobu
dc.contributor.authorDiao Y.X.
dc.contributor.authorDong X.Q.
dc.contributor.authorDuan K.K.
dc.contributor.authorFan J.H.
dc.contributor.authorFan Y.Z.
dc.contributor.authorFang J.
dc.contributor.authorFang J.H.
dc.contributor.authorFang K.
dc.contributor.authorFeng C.F.
dc.contributor.authorFeng H.
dc.contributor.authorFeng L.
dc.contributor.authorFeng S.H.
dc.contributor.authorFeng X.T.
dc.contributor.authorFeng Y.
dc.contributor.authorFeng Y.L.
dc.contributor.authorGabici S.
dc.contributor.authorGao B.
dc.contributor.authorGao C.D.
dc.contributor.authorGao Q.
dc.contributor.authorGao W.
dc.contributor.authorGao W.K.
dc.contributor.authorGe M.M.
dc.contributor.authorGe T.T.
dc.contributor.authorGeng L.S.
dc.contributor.authorGiacinti G.
dc.contributor.authorGong G.H.
dc.contributor.authorGou Q.B.
dc.contributor.authorGu M.H.
dc.contributor.authorGuo F.L.
dc.contributor.authorGuo J.
dc.contributor.authorGuo X.L.
dc.contributor.authorGuo Y.Q.
dc.contributor.authorGuo Y.Y.
dc.contributor.authorHan Y.A.
dc.contributor.authorHannuksela O.A.
dc.contributor.authorHasan M.
dc.contributor.authorHe H.H.
dc.contributor.authorHe H.N.
dc.contributor.authorHe J.Y.
dc.contributor.authorHe X.Y.
dc.contributor.authorHe Y.
dc.contributor.authorHernández-Cadena S.
dc.contributor.authorHou B.W.
dc.contributor.authorHou C.
dc.contributor.authorHou X.
dc.contributor.authorHu H.B.
dc.contributor.authorHu S.C.
dc.contributor.authorHuang C.
dc.contributor.authorHuang D.H.
dc.contributor.authorHuang J.J.
dc.contributor.authorHuang T.Q.
dc.contributor.authorHuang W.J.
dc.contributor.authorHuang X.T.
dc.contributor.authorHuang X.Y.
dc.contributor.authorHuang Y.
dc.contributor.authorHuang Y.Y.
dc.contributor.authorJi X.L.
dc.contributor.authorJia H.Y.
dc.contributor.authorJia K.
dc.contributor.correspondenceCao Z.
dc.contributor.otherMahidol University
dc.date.accessioned2026-05-25T18:19:16Z
dc.date.available2026-05-25T18:19:16Z
dc.date.issued2026-05-08
dc.description.abstractWe report the first detection of gamma-ray emission up to ultrahigh-energy (UHE; >100 TeV) emission from the prototypical gamma-ray binary system LS I +61° 303 using data from the Large High Altitude Air Shower Observatory. It is detected with significances of 9.2σ in the Water Cherenkov Detector Array (WCDA, 1.4-30.5 TeV) and 6.2σ in the Kilometer Square Array (KM2A, 25-267 TeV); in KM2A alone we identify 16 photonlike events above 100 TeV against an estimated 5.1 background events, corresponding to a 3.8σ detection. These results provide compelling evidence of extreme particle acceleration in LS I +61° 303. Furthermore, we observe orbital modulation at 3.9σ confidence level, between 25 and 100 TeV, with a hint that the orbital modulation is energy dependent. These features can be understood in a composite scenario in which leptonic and hadronic processes jointly contribute.
dc.identifier.citationPhysical Review Letters Vol.136 No.18 (2026)
dc.identifier.doi10.1103/7xhp-tff7
dc.identifier.eissn10797114
dc.identifier.issn00319007
dc.identifier.scopus2-s2.0-105039181254
dc.identifier.urihttps://repository.li.mahidol.ac.th/handle/123456789/116842
dc.rights.holderSCOPUS
dc.subjectPhysics and Astronomy
dc.titleFirst Detection of Ultrahigh Energy Emission from Gamma-Ray Binary LS I +61° 303
dc.typeArticle
mu.datasource.scopushttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=105039181254&origin=inward
oaire.citation.issue18
oaire.citation.titlePhysical Review Letters
oaire.citation.volume136
oairecerif.author.affiliationUniversity of Chinese Academy of Sciences
oairecerif.author.affiliationTsinghua University
oairecerif.author.affiliationShanghai Jiao Tong University
oairecerif.author.affiliationSun Yat-Sen University
oairecerif.author.affiliationUniversité Paris Cité
oairecerif.author.affiliationUniversity of Science and Technology of China
oairecerif.author.affiliationShandong University
oairecerif.author.affiliationNanjing University
oairecerif.author.affiliationChinese University of Hong Kong
oairecerif.author.affiliationZhengzhou University
oairecerif.author.affiliationSouthwest Jiaotong University
oairecerif.author.affiliationYunnan University
oairecerif.author.affiliationGuangzhou University
oairecerif.author.affiliationInstitute of High Energy Physics, Chinese Academy of Sciences
oairecerif.author.affiliationNational Astronomical Observatories Chinese Academy of Sciences
oairecerif.author.affiliationHebei Normal University
oairecerif.author.affiliationMax-Planck-Institut für Kernphysik
oairecerif.author.affiliationInstitute for Nuclear Research of the Russian Academy of Sciences
oairecerif.author.affiliationYerevan State University
oairecerif.author.affiliationChina Center of Advanced Science and Technology World Laboratory
oairecerif.author.affiliationZhejiang Lab
oairecerif.author.affiliationPurple Mountain Observatory Chinese Academy of Sciences
oairecerif.author.affiliationShanghai Astronomical Observatory Chinese Academy of Sciences
oairecerif.author.affiliationYunnan Observatories
oairecerif.author.affiliationTibet University
oairecerif.author.affiliationState Key Laboratory of Particle Detection & Electronics
oairecerif.author.affiliationTIANFU Cosmic Ray Research Center

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