SEARCH FOR GAMMA RAYS ABOVE 100 TeV FROM THE CRAB NEBULA WITH THE TIBET AIR SHOWER ARRAY AND THE 100 m{sup 2} MUON DETECTOR
- Department of Physics, Hirosaki University, Hirosaki 036-8561 (Japan)
- Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China)
- National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)
- Department of Mathematics and Physics, Tibet University, Lhasa 850000 (China)
- Department of Physics, Hebei Normal University, Shijiazhuang 050016 (China)
- Department of Physics, Shandong University, Jinan 250100 (China)
- Institute of Modern Physics, SouthWest Jiaotong University, Chengdu 610031 (China)
- Faculty of Engineering, Kanagawa University, Yokohama 221-8686 (Japan)
- Faculty of Education, Utsunomiya University, Utsunomiya 321-8505 (Japan)
A 100 m{sup 2} muon detector (MD) was successfully constructed under the existing Tibet air shower (AS) array in the late fall of 2007. The sensitivity of the Tibet AS array to cosmic gamma rays can be improved by selecting muon-poor events with the MD. Our MC simulation of the MD response reasonably agrees with the experimental data in terms of the charge distribution for one-muon events and the background rejection power. Using the data collected by the Tibet AS array and the 100 m{sup 2} MD taken from 2008 March to 2010 February, we search for continuous gamma-ray emission from the Crab Nebula above ∼100 TeV. No significant excess is found, and the most stringent upper limit is obtained above 140 TeV.
- OSTI ID:
- 22521949
- Journal Information:
- Astrophysical Journal, Vol. 813, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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