Search for Pulsed TeV Gamma-Ray Emission from the Crab Pulsar
Search for Pulsed TeV Gamma-Ray Emission from the Crab Pulsar
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寻找蟹状脉冲星的脉冲 TeV 伽马射线发射
DOI：
10.1086/308495
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
T. Weekes
中科院分区：
文献类型：
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作者：
R. Lessard;I. Bond;S. Bradbury;J. Buckley;A. Burdett;D. Carter;M. Catanese;M. Cawley;M. D’Vali;D. Fegan;J. Finley;J. Gaidos;G. Gillanders;T. Hall;A. Hillas;F. Krennrich;M. Lang;C. Masterson;P. Moriarty;J. Quinn;H. Rose;F. Samuelson;G. Sembroski;R. Srinivasan;V. Vassiliev;T. Weekes
我们展示了使用惠普尔天文台的10米伽马射线望远镜对蟹状星云脉冲星脉冲太电子伏发射进行搜索的结果。在1994年11月至1997年3月期间，对蟹状星云脉冲星的方向总共观测了73.4小时。在此期间，惠普尔10米望远镜以其迄今为止最低的能量阈值运行。应用光谱分析技术在250 GeV到4 TeV的能段搜索来自蟹状星云脉冲星的伽马射线信号。我们没有看到蟹状星云脉冲星在其他能段存在的33毫秒脉冲的任何证据。250 GeV以上脉冲发射的99.9%置信水平上限被推导为4.8×10⁻¹² 厘米⁻² 秒⁻¹，或者小于蟹状星云稳定通量的3%。这些结果意味着康普顿伽马射线天文台的EGRET仪器所观测到的幂律谱急剧截止。如果截止是指数形式的，它必须在60 GeV或更低处开始，以符合这些上限。
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.