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Search for Pulsed TeV Gamma-Ray Emission from the Crab Pulsar

机译:从螃蟹脉冲星中搜索脉冲TeV伽马射线发射

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We present the results of a search for pulsed TeV emission from the Crab pulsar using the Whipple Observatory's 10-m gamma-ray telescope. The direction of the Crab pulsar was observed for a total of 73.4?hr between 1994 November and 1997 March. During this period the Whipple 10 m telescope was operated at its lowest energy threshold to date. Spectral analysis techniques were applied to search for the presence of a gamma-ray signal from the Crab pulsar over the energy band 250 GeV to 4 TeV. We do not see any evidence of the 33?ms pulsations present in other energy bands from the Crab pulsar. The 99.9% confidence level upper limit for pulsed emission above 250 GeV is derived to be 4.8 × 10-12 cm-2 s-1 or less than 3% of the steady flux from the Crab Nebula. These results imply a sharp cutoff of the power-law spectrum seen by the EGRET instrument on the Compton Gamma-Ray Observatory. If the cutoff is exponential, it must begin at 60 GeV or lower to accommodate these upper limits.
机译:我们展示了使用Whipple天文台的10米伽马射线望远镜从蟹状脉冲星搜索脉冲TeV发射的结果。在1994年11月至1997年3月之间,共观测到蟹状脉冲星的方向总计73.4小时。在此期间,Whipple 10 m望远镜以迄今为止的最低能量阈值运行。光谱分析技术被用来搜索在250 GeV到4 TeV能带上来自Crab脉冲星的伽马射线信号的存在。我们没有看到任何证据表明螃蟹脉冲星在其他能带中存在33?ms的脉动。高于250 GeV的脉冲发射的99.9%置信水平上限为4.8×10-12 cm-2 s-1或不到来自蟹状星云的稳定通量的3%。这些结果暗示了康普顿伽玛射线天文台上的EGRET仪器所观察到的幂律谱的急剧截止。如果截断是指数,则截断必须从60 GeV或更低开始,以适应这些上限。
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