Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-04-11
Astronomy and Astrophysics
Astrophysics
This paper has been accepted by hepnp
Scientific paper
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.
Bi Xiao-Jun
Cui Shu-Wen
Danzengluobu
Ding Lin-Kai
Ding X. H.
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