You X.Hu S.Xi S.Cao Z.Aharonian F.An Q.AxikeguBai Y.X.Bao Y.W.Bastieri D.Bi X.J.Bi Y.J.Cai J.T.Cao Q.Cao W.Y.Cao Z.Chang J.Chang J.F.Chen A.M.Chen E.S.Chen L.Chen L.Chen L.Chen M.J.Chen M.L.Chen Q.H.Chen S.H.Chen S.Z.Chen T.L.Chen Y.Cheng N.Cheng Y.D.Cui M.Y.Cui S.W.Cui X.H.Cui Y.D.Dai B.Z.Dai H.L.Dai Z.G.Danzengluobudella Volpe D.Dong X.Q.Duan K.K.Fan J.H.Fan Y.Z.Fang J.Fang K.Feng C.F.Feng L.Feng S.H.Feng X.T.Feng Y.L.Gabici S.Gao B.Gao C.D.Gao L.Q.Gao Q.Gao W.Gao W.K.Ge M.M.Geng L.S.Giacinti G.Gong G.H.Gou Q.B.Gu M.H.Guo F.L.Guo X.L.Guo Y.Q.Guo Y.Y.Han Y.A.He H.H.He H.N.He J.Y.He X.B.He Y.Heller M.Hor Y.K.Hou B.W.Hou C.Hou X.Hu H.B.Hu Q.Hu S.C.Huang D.H.Huang T.Q.Huang W.J.Huang X.T.Huang X.Y.Huang Y.Huang Z.C.Ji X.L.Jia H.Y.Jia K.Jiang K.Jiang X.W.Jiang Z.J.Jin M.Kang M.M.Ke T.Kuleshov D.Mahidol University2024-12-232024-12-232024-09-27Proceedings of Science Vol.444 (2024)https://repository.li.mahidol.ac.th/handle/123456789/102490Searching for ultra-high energy (PeV) cosmic ray accelerating source is the core problem in the study of cosmic ray origin. One of the most direct methods is to look for the ultra-high energy gamma-ray radiation generated by the interaction between cosmic rays and interstellar gas near the accelerator. Twelve ultra-high energy gamma ray sources have been observed on the galactic disk by the Large High Altitude Air Shower Observatory (LHAASO). Here, we report the result for LHAASO J1825-1326 region using the Water Cherencov detector array (WCDA) and kilometer array (KM2A) data. The γ-ray emission above 1 TeV observed by LHAASO from the region of LHAASO J1825-1326 is well described by four components including galactic diffuse emission, 1LHAASO J1825-1418 and 1LHAASO J1825-1256u, the likely counterparts to known γ-ray sources, HAWC J1825-138 and HAWC J1826-128, respectively, and LHAASO J1825-1256u in the middle. At present, the origin and radiation mechanism of 1LHAASO J1825-1337u can not be fully confirmed. While CRs accelerated to energies of several PeV colliding with the ambient gas likely produce the observed radiation.MultidisciplinaryConference PaperSCOPUS2-s2.0-8518556899818248039