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An Updated Search of Steady TeV γ-Ray Point Sources in Northern Hemisphere Using the Tibet Air Shower Array

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arxiv 0804.1862 v2 pith:OXBPPMQZ submitted 2008-04-11 astro-ph

An Updated Search of Steady TeV γ-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
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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
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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 $0.0^{\circ}$ to $60.0^{\circ}$ 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 are approximately improved by 1.7 times as compared with our previous reported limits.

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