First Detection of Photons with Energy Beyond 100 TeV from an Astrophysical Source. (arXiv:1906.05521v1 [astro-ph.HE])

First Detection of Photons with Energy Beyond 100 TeV from an Astrophysical Source. (arXiv:1906.05521v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Amenomori_M/0/1/0/all/0/1">M. Amenomori</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bao_Y/0/1/0/all/0/1">Y. W. Bao</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bi_X/0/1/0/all/0/1">X. J. Bi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chen_D/0/1/0/all/0/1">D. Chen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chen_T/0/1/0/all/0/1">T. L. Chen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chen_W/0/1/0/all/0/1">W. Y. Chen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chen_X/0/1/0/all/0/1">Xu Chen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chen_Y/0/1/0/all/0/1">Y. Chen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cirennima/0/1/0/all/0/1">Cirennima</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cui_S/0/1/0/all/0/1">S. W. Cui</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Danzengluobu/0/1/0/all/0/1">Danzengluobu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ding_L/0/1/0/all/0/1">L. K. Ding</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fang_J/0/1/0/all/0/1">J. H. Fang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fang_K/0/1/0/all/0/1">K. Fang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Feng_C/0/1/0/all/0/1">C. F. Feng</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Feng_Z/0/1/0/all/0/1">Zhaoyang Feng</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Feng_Z/0/1/0/all/0/1">Z. Y. Feng</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gao_Q/0/1/0/all/0/1">Qi Gao</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gou_Q/0/1/0/all/0/1">Q. B. Gou</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Guo_Y/0/1/0/all/0/1">Y. Q. Guo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+He_H/0/1/0/all/0/1">H. H. He</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+He_Z/0/1/0/all/0/1">Z. T. He</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hibino_K/0/1/0/all/0/1">K. Hibino</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hotta_N/0/1/0/all/0/1">N. 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We report on the highest energy photons from the Crab Nebula observed by the
Tibet air shower array with the underground water-Cherenkov-type muon detector
array. Based on the criterion of muon number measured in an air shower, we
successfully suppress 99.92% of the cosmic-ray background events with energies
$E>100$ TeV. As a result, we observed 24 photon-like events with $E>100$ TeV
against 5.5 background events, which corresponds to 5.6$sigma$ statistical
significance. This is the first detection of photons with $E>100$ TeV from an
astrophysical source.

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