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Search For Steady Pev Gamma-Ray Emission From The Monogem Ring With The Tibet Air Shower Array

M Amenomori,S Ayabe,Deng Feng Chen,S W Cui,Danzengluobu,L K Ding,Xuhua Ding,C F Feng,Z Y Feng,X Y Gao,Qixian Geng,H W Guo,Huahai He,Mao He,K Hibino,Norifumi Hotta,Haibing Hu,Jian Huang,Qing Huang,H Y Jia,F Kajino,Kazuo Kasahara,Yusaku Katayose,Chihiro Kato,K Kawata, Labaciren,G M Le,J Y Li,H Y Lu,Shihlien Lu,X R Meng,Kohei Mizutani,Jin Mu,Kazuoki Munakata, A Nagia,H Nanjo,M Nishizawa,Makoto Ohnishi,I Ohta,H Onuma,T Ouchi,Soji Ozawa,J R Ren,Takayuki Saito,Miho Sakata,Toshiyuki Sasaki,Masaru Shibata,A Shiomi,Toshiyuki Shirai,Hidehiko Sugimoto,M Takita,Y H Tan,N Tateyama,Shoji Torii,H Tsuchiya,S Udo,H Y Wang,Xiao Wang,Yue Wang,Hong Wu,Long Xue,Yoshihiro Yamamoto,C T Yan,X C Yang,S Yasue,Z H Ye,Guangce Yu,A F Yuan,T Yuda,H Michael Zhang,J L Zhang,N J Zhang,X Z Zhang, Y J Zhang,Zhaxisangzhu,Xiaoxiao Zhou

Proceedings of the 29th International Cosmic Ray Conference, Vol 4: OG 2.1, 2.2 & 2.3（2005）

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Abstract
We searched for steady PeV gamma-ray emission from the Monogem, Ring region with the Tibet air shower array from February 1997 to October 2004. No evidence for statistically significant gamma-ray signals was found in a region 111 degrees <= right ascension <= 114 degrees, 12.5 degrees <= declination < 15.5 degrees in the Monogem Ring where the MAKET-ANI experiment recently claimed a positive detection of PeV high energy cosmic radiation. We set a 99% confidence-level integral flux upper limit of 4.0 x 10(-12) cm(-2) s(-1) sr(-1) above 1 PeV on diffuse gamma-rays extended in the 3 degrees x 3 degrees region, which corresponds to a 10% of the flux estimated by the result from the MAKET-ANI experiment.
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gamma ray
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