Observation of multi-TeV gamma rays from the Crab Nebula using the Tibet air shower array

M. Amenomori, S. Ayabe, P. Y. Cao, Danzengluobu, L. K. Ding, Z. Y. Feng, Y. Fu, H. W. Guo, M. He, K. Hibino, N. Hotta, Q. Huang, A. X. Huo, K. Izu, H. Y. Jia, F. Kajino, K. Kasahara, Y. Katayose, Labaciren, J. Y. LiH. Lu, S. L. Lu, G. X. Luo, X. R. Meng, K. Mizutani, J. Mu, H. Nanjo, M. Nishizawa, M. Ohnishi, I. Ohta, T. Ouchi, J. R. Ren, T. Saito, M. Sakata, T. Sasaki, Z. Z. Shi, M. Shibata, A. Shiomi, T. Shirai, H. Sugimoto, K. Taira, Y. H. Tan, N. Tateyama, Shoji Torii, T. Utsugi, C. R. Wang, H. Wang, X. W. Xu, Y. Yamamoto, G. C. Yu, A. F. Yuan, T. Yuda, C. S. Zhang, H. M. Zhang, J. L. Zhang, N. J. Zhang, X. Y. Zhang, Zhaxisangzhu, Zhaxiciren, W. D. Zhou

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

The Tibet experiment, operating at Yangbajing (4300 m above sea level), is the lowest energy air shower array, and the new high-density array constructed in 1996 is sensitive to γ-ray air showers at energies as low as 3 TeV. With this new array, the Crab Nebula was observed in multi-TeV γ-rays and a signal was detected at the 5.5 σ level. We also obtained the energy spectrum of γ-rays in the energy region above 3 TeV which partially overlaps those observed with imaging atmospheric Cerenkov telescopes. The Crab spectrum observed in this energy region can be represented by the power-law fit dJ(E)/dE = (4.61 ± 0.90) x 10-12(E/3 TeV)-2.62 ± 0.17cm-2 s-1 TeV-1. This is the first observation of γ-ray signals from point sources with a conventional air shower array using scintillation detectors.

Original languageEnglish
JournalAstrophysical Journal
Volume525
Issue number2 PART 2
Publication statusPublished - 1999 Nov 10
Externally publishedYes

Keywords

  • Gamma rays: observations
  • ISM: individual (Crab Nebula)
  • Supernova remnants

ASJC Scopus subject areas

  • Space and Planetary Science

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  • Cite this

    Amenomori, M., Ayabe, S., Cao, P. Y., Danzengluobu, Ding, L. K., Feng, Z. Y., Fu, Y., Guo, H. W., He, M., Hibino, K., Hotta, N., Huang, Q., Huo, A. X., Izu, K., Jia, H. Y., Kajino, F., Kasahara, K., Katayose, Y., Labaciren, ... Zhou, W. D. (1999). Observation of multi-TeV gamma rays from the Crab Nebula using the Tibet air shower array. Astrophysical Journal, 525(2 PART 2).