| An updated search of steady TeV γ-ray point sources in northern hemisphere using the Tibet air shower array |
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| 引用本文： | 汪越,毕效军,崔树旺,丁林恺.An updated search of steady TeV γ-ray point sources in northern hemisphere using the Tibet air shower array[J].中国物理 C,2008,32(11):868-872. |
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| 作者姓名： | 汪越 毕效军 崔树旺 丁林恺 |
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| 作者单位： | Key Laboratory of Particle Astrophysics，Institute of High Energy Physics，Chinese Academy of Sciences，Department of Physics，Hebei Normal University，Department of Mathematics and Physics，Tibet University，Department of Physics，Shandong University，Institute of Modern Physics，Southwest Jiaotong University，Department of Physics，Yunnan University，National Center for Space Weather，China Meteorological Administration，Physics Department and Tsinghua Center for Astrophysics，Tsinghua University，Center of Space Science and Application Research，Chinese Academy of Sciences |
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| 摘 要： | 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 γ-ray point sources has now been updated by a factor of 2.8 improved statistics. From 0.0° to 60.0° in declination (Dec) range, no new TeV γ-ray point sources with sufficiently high significance were identified while the well-known Crab Nebula and Mrk421 remain to be the brightest TeV γ-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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| 关 键 词： | ASγ experiment γ-ray point sources 90% C.L. flux pper limits |
| 收稿时间： | 2008-1-18 |
| 修稿时间： | 2008-4-9 |
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