Search For Multi-Tev Gamma-Ray Emission From Nearby Snrs With The Tibet Air Shower Array
AIP Conference Proceedings(2001)
Abstract
The Tibet air-shower array operating at Yangbajing (4300 m above sea level) is sensitive to gamma-ray air showers at energies as low as 3 TeV. The observation of the moon's shadow has provided a direct check of the angular resolution, the energy estimation and the systematic pointing error of this air-shower array. Using these data, we have searched for multi-TeV gamma-ray emission from 21 SNRs located within 5 kpc distance in the declination band of 0 degrees to +60 degrees. The signal from the Crab Nebula was detected at 5.5 sigma level as described another paper. No significant DC excess exceeding 5 sigma level was found from any of these SNRs except from the Crab Nebula. The results of nearby eight SNRs piled up gave a flux upper limit slightly lower than the expected values for a simple model of shock acceleration.
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Key words
gamma ray
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