Multi-TeV gamma-ray emission from the Crab Nebula observed with the new Tibet-III air-shower array

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Scientific paper

Using a high density air-shower array (Tibet-HD array), we succeeded in detecting multi-TeV γ-ray signals from the Crab Nebula in 1999. In the late fall of 1999, the HD array was enlarged from 5175 m2 up to 22000 m2 (TibetIII array). Using the 316 live-day data taken between 1999 November and 2001 May with this enlarged new array, we studied the emission of TeV γ-rays from the Crab Nebula. A preliminary analysis gives the excess γ-ray signal at the statistical significance of 4.8 σ. The energy spectrum of γrays observed is consistent with the previous observation. We report the result on the study of the Crab flux.

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