Search For Multi-Tev Gamma-Ray Emission From Nearby Snrs With The Tibet Air Shower Array

M Amenomori,S Ayabe, Caidong, Danzengluobu,Lk Ding,Zy Feng,Y Fu,Hw Guo,M He,K Hibino,N Hotta,J Huang,Q Huang,Ax Huo,K Izu,Hy Jia,F Kajino,K Kasahara,Y Katayose,K Kawata, Labaciren,Jy Li,H Lu,Sl Lu,Gx Luo,Xr Meng,K Mizutani,J Mu,H Nanjo,M Nishizawa,M Ohnishi,I Ohta,T Ouchi,S Ozawa,Zr Peng,Jr Ren,T Saito,M Sakata,T Sasaki,Zz Shi,M Shibata,A Shiomi,T Shirai,H Sugimoto, H Sugiyama,K Taira,Yh Tan,N Tateyama,S Torii,T Utsugi,Cr Wang,H Wang,Xw Xu,Y Yamamoto,Gc Yu,Af Yuan,T Yuda,Cs Zhang,Hm Zhang,Jl Zhang,Nj Zhang,Xy Zhang, Zhaxiciren, Zhaxisangzhu

AIP Conference Proceedings（2001）

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Abstract

The Tibet air-shower array operating at Yangbajing (4300 m above sea level) is sensitive to gamma-ray air showers at energies as low as 3 TeV. The observation of the moon's shadow has provided a direct check of the angular resolution, the energy estimation and the systematic pointing error of this air-shower array. Using these data, we have searched for multi-TeV gamma-ray emission from 21 SNRs located within 5 kpc distance in the declination band of 0 degrees to +60 degrees. The signal from the Crab Nebula was detected at 5.5 sigma level as described another paper. No significant DC excess exceeding 5 sigma level was found from any of these SNRs except from the Crab Nebula. The results of nearby eight SNRs piled up gave a flux upper limit slightly lower than the expected values for a simple model of shock acceleration.

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Key words

gamma ray

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