Publication:
Performance of LHAASO-WCDA and observation of the Crab Nebula as a standard candle

Issued Date

2021-08-01

Resource Type

Article

ISSN

16741137

DOI

10.1088/1674-1137/ac041b

Other identifier(s)

2-s2.0-85112147946

Rights

Mahidol University

Rights Holder(s)

SCOPUS

Bibliographic Citation

Chinese Physics C. Vol.45, No.8 (2021)

Suggested Citation

F. Aharonian, Q. An, Axikegu, L. X. Bai, Y. X. Bai, Y. W. Bao, D. Bastieri, X. J. Bi, Y. J. Bi, H. Cai, J. T. Cai, Z. Cao, J. Chang, J. F. Chang, X. C. Chang, B. M. Chen, J. Chen, L. Chen, M. J. Chen, M. L. Chen, Q. H. Chen, S. H. Chen, S. Z. Chen, T. L. Chen, X. L. Chen, Y. Chen, N. Cheng, Y. D. Cheng, S. W. Cui, X. H. Cui, Y. D. Cui, B. Z. Dai, H. L. Dai, Z. G. Dai, Danzengluobu, D. della Volpe, B. D'Ettorre Piazzoli, X. J. Dong, J. H. Fan, Y. Z. Fan, Z. X. Fan, J. Fang, K. Fang, C. F. Feng, L. Feng, S. H. Feng, Y. L. Feng, B. Gao, C. D. Gao, Q. Gao, W. Gao, M. M. Ge, L. S. Geng, G. H. Gong, Q. B. Gou, M. H. Gu, J. G. Guo, X. L. Guo, Y. Q. Guo, Y. Y. Guo, Y. A. Han, H. H. He, H. N. He, J. C. He, S. L. He, X. B. He, Y. He, M. Heller, Y. K. Hor, C. Hou, X. Hou, H. B. Hu, S. Hu, S. C. Hu, X. J. Hu, D. H. Huang, Q. L. Huang, W. H. Huang, X. T. Huang, Z. C. Huang, F. Ji, X. L. Ji, H. Y. Jia, K. Jiang, Z. J. Jiang, C. Jin, D. Kuleshov, K. Levochkin, B. B. Li, C. Li, F. Li, H. B. Li, H. C. Li, H. Y. Li, J. Li, K. Li, W. L. Li, X. Li, X. R. Li, Y. Li Performance of LHAASO-WCDA and observation of the Crab Nebula as a standard candle. Chinese Physics C. Vol.45, No.8 (2021). doi:10.1088/1674-1137/ac041b Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/78994

Research Projects

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Thesis

Title

Performance of LHAASO-WCDA and observation of the Crab Nebula as a standard candle

Author(s)

F. Aharonian
 Q. An
 Axikegu
 L. X. Bai
 Y. X. Bai
 Y. W. Bao
 D. Bastieri
 X. J. Bi
 Y. J. Bi
 H. Cai
 J. T. Cai
 Z. Cao
 J. Chang
 J. F. Chang
 X. C. Chang
 B. M. Chen
 J. Chen
 L. Chen
 M. J. Chen
 M. L. Chen
 Q. H. Chen
 S. H. Chen
 S. Z. Chen
 T. L. Chen
 X. L. Chen
 Y. Chen
 N. Cheng
 Y. D. Cheng
 S. W. Cui
 X. H. Cui
 Y. D. Cui
 B. Z. Dai
 H. L. Dai
 Z. G. Dai
 Danzengluobu
 D. della Volpe
 B. D'Ettorre Piazzoli
 X. J. Dong
 J. H. Fan
 Y. Z. Fan
 Z. X. Fan
 J. Fang
 K. Fang
 C. F. Feng
 L. Feng
 S. H. Feng
 Y. L. Feng
 B. Gao
 C. D. Gao
 Q. Gao
 W. Gao
 M. M. Ge
 L. S. Geng
 G. H. Gong
 Q. B. Gou
 M. H. Gu
 J. G. Guo
 X. L. Guo
 Y. Q. Guo
 Y. Y. Guo
 Y. A. Han
 H. H. He
 H. N. He
 J. C. He
 S. L. He
 X. B. He
 Y. He
 M. Heller
 Y. K. Hor
 C. Hou
 X. Hou
 H. B. Hu
 S. Hu
 S. C. Hu
 X. J. Hu
 D. H. Huang
 Q. L. Huang
 W. H. Huang
 X. T. Huang
 Z. C. Huang
 F. Ji
 X. L. Ji
 H. Y. Jia
 K. Jiang
 Z. J. Jiang
 C. Jin
 D. Kuleshov
 K. Levochkin
 B. B. Li
 C. Li
 F. Li
 H. B. Li
 H. C. Li
 H. Y. Li
 J. Li
 K. Li
 W. L. Li
 X. Li
 X. R. Li
 Y. Li

Other Contributor(s)

State Key Laboratory of Particle Detection & Electronics
 Nanjing University
 Shanghai Astronomical Observatory Chinese Academy of Sciences
 Institute for Nuclear Research of the Russian Academy of Sciences
 Shandong University
 Wuhan University
 Yunnan University
 Institute of High Energy Physics Chinese Academy of Science
 University of Chinese Academy of Sciences
 Guangzhou University
 Tsinghua University
 Sun Yat-Sen University
 University of Science and Technology of China
 Zhengzhou University
 Dublin Institute for Advanced Studies
 Università degli Studi di Napoli Federico II
 Sichuan University
 National Astronomical Observatories Chinese Academy of Sciences
 Max-Planck-Institut für Kernphysik
 Southwest Jiaotong University
 Purple Mountain Observatory Chinese Academy of Sciences
 Université de Genève
 Hebei Normal University
 Tibet University
 TIANFU Cosmic Ray Research Center

Abstract

The first Water Cherenkov detector of the LHAASO experiment (WCDA-1) has been operating since April 2019. The data for the first year have been analyzed to test its performance by observing the Crab Nebula as a standard candle. The WCDA-1 achieves a sensitivity of 65 mCU per year, with a statistical threshold of 5 σ. To accomplish this, a 97.7% cosmic-ray background rejection rate around 1 TeV and 99.8% around 6 TeV with an approximate photon acceptance of 50% is achieved after applying an algorithm to separate gamma-induced showers. The angular resolution is measured using the Crab Nebula as a point source to be approximately 0.45° at 1 TeV and better than 0.2° above 6 TeV, with a pointing accuracy better than 0.05°. These values all match the design specifications. The energy resolution is found to be 33% for gamma rays around 6 TeV. The spectral energy distribution of the Crab Nebula in the range from 500 GeV to 15.8 TeV is measured and found to be in agreement with the results from other TeV gamma ray observatories.

Keyword(s)

Physics and Astronomy

Availability

URI

https://repository.li.mahidol.ac.th/handle/20.500.14594/78994

Collections

Scopus 2021