An updated search of steady TeV γ-ray point sources in northern hemisphere using the Tibet air shower array

• Published in: Chinese physics C Vol. 32; no. 11; pp. 868 - 872
• Main Author: 汪越 毕郊军 崔树旺 丁林恺 丹增罗布 丁晓红 樊超 冯存峰 冯朝阳 冯振勇 高晓宇 耿庆喜 郭宏伟 何会海 何瑁 胡海冰 胡红波 黄庆 贾焕玉 拉巴次仁 乐贵明 李爱凤 李金玉 楼宇庆 卢红 陆穗苓 孟宪茹 木钧 任敬儒 谭有恒 王博 王辉 王永刚 吴含荣 薛良 杨先楚 叶宗海 余光策 袁爱芳 张慧敏 张吉龙 张乃健 张学尧 张勇 张毅 扎西桑珠 周勋秀 袁强
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.11.2008; Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China%Department of Physics,Hebei Normal University,Shijiazhuang 050016,China%Department of Mathematics and Physics,Tibet University,Lhasa 850000,China%Department of Physics,Shandong University,Jinan 250100,China%Institute of Modern Physics,Southwest Jiaotong University,Chengdu 610031,China%Department of Physics,Yunnan University,Kunming 650091,China%National Center for Space Weather,China Meteorological Administration,Beijing 100081,China%Physics Department and Tsinghua Center for Astrophysics,Tsinghua University,Beijing 100084,China%Center of Space Science and Application Research,Chinese Academy of Sciences,Beijing 100080,China
• Subjects: ASγ实验; γ射线点源; 降雨排序; 90％ C.L; γ-ray point sources; ASγ experiment; flux upper limits
• ISSN: 1674-1137; 0254-3052; 2058-6132
• DOI: 10.1088/1674-1137/32/11/004

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 T-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.