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An Updated Search Of Steady Tev Gamma-Ray Point Sources In Northern Hemisphere Using The Tibet Air Shower Array

Y. Wang,X. J. Bi,S. W. Cui,L. K. Ding,Danzengluobu,X. H. Ding,C. Fan,C. F. Feng,Zhaoyang Feng,Z. Y. Feng,X. Y. Gao,Q. X. Geng,H. W. Guo,H. H. He,M. He,Haibing Hu,H. B. Hu,Q. Huang,H. Y. Jia, Labaciren,G. M. Le,A. F. Li,J. Y. Li,Y.-Q. Lou,H. Lu,S. L. Lu,X. R. Meng,J. Mu,J. R. Ren,Y. H. Tan,B. Wang,H. Wang,Y. G. Wang,H. R. Wu,L. Xue,X. C. Yang,Z. H. Ye,G. C. Yu,A. F. Yuan,H. M. Zhang,J. L. Zhang,N. J. Zhang,X. Y. Zhang,Y. Zhang,Yi Zhang,Zhaxisangzhu,X. X. Zhou,Q. Yuan

CHINESE PHYSICS C（2008）

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Abstract
Using the data taken from Tibet II High Density (HD) Array (1997 February-1999 September) and Tibet-III array (1999 November-2005 November), our previous northern sky survey for TeV gamma-ray point sources has now been updated by a factor of 2.8 improved statistics. From 0.0 degrees to 60.0 degrees in declination (Dec) range, no new TeV gamma-ray point sources with sufficiently high significance were identified while the well-known Crab Nebula and Mrk421 remain to be the brightest TeV gamma-ray sources within the field of view of the Tibet air shower array. Based on the currently available data and at the 90% confidence level (C.L.), the flux upper limits for different power law index assumption are re-derived, which axe approximately improved by 1.7 times as compared with our previous reported limits.
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Key words
AS gamma experiment, gamma-ray point sources, 90% CL, flux upper limits
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