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

被引：13

作者：

Aharonian, F. ^{[31
,32
]}

An, Q. ^{[6
,7
]}

Axikegu ^{[24
,25
]}

Bai, L. X. ^{[26
]}

Bai, Y. X. ^{[1
,2
,3
,5
]}

Bao, Y. W. ^{[18
]}

Bastieri, D. ^{[12
]}

Bi, X. J. ^{[1
,2
,3
,4
,5
]}

Bi, Y. J. ^{[1
,2
,3
,5
]}

Cai, H. ^{[28
]}

Cai, J. T. ^{[12
]}

Cao, Z. ^{[1
,2
,3
,4
,5
,6
,7
]}

Chang, J. ^{[19
]}

Chang, J. F. ^{[1
,2
,3
,5
,6
]}

Chang, X. C. ^{[1
,2
,3
,5
]}

Chen, B. M. ^{[16
]}

Chen, J. ^{[26
]}

Chen, L. ^{[1
,2
,3
,4
,5
,21
,24
,25
]}

Chen, M. J. ^{[1
,2
,3
,5
]}

Chen, M. L. ^{[1
,2
,3
,5
,6
]}

Chen, Q. H. ^{[24
,25
]}

Chen, S. H. ^{[1
,2
,3
,4
,5
]}

Chen, S. Z. ^{[1
,2
,3
,5
]}

Chen, T. L. ^{[27
]}

Chen, X. L. ^{[1
,2
,3
,4
,5
]}

Chen, Y. ^{[18
]}

Cheng, N. ^{[1
,2
,3
,5
]}

Cheng, Y. D. ^{[1
,2
,3
,5
]}

Cui, S. W. ^{[16
]}

Cui, X. H. ^{[9
]}

Cui, Y. D. ^{[13
,14
]}

Dai, B. Z. ^{[29
]}

Dai, H. L. ^{[1
,2
,3
,5
,6
]}

Dai, Z. G. ^{[18
]}

Danzengluobu ^{[27
]}

della Volpe, D. ^{[36
]}

Piazzoli, B. D'Ettorre ^{[33
]}

Dong, X. J. ^{[1
,2
,3
,5
]}

Fan, J. H. ^{[12
]}

Fan, Y. Z. ^{[19
]}

Fan, Z. X. ^{[1
,2
,3
,5
]}

Fang, J. ^{[29
]}

Fang, K. ^{[1
,2
,3
,5
]}

Feng, C. F. ^{[20
]}

Feng, L. ^{[19
]}

Feng, S. H. ^{[1
,2
,3
,5
]}

Feng, Y. L. ^{[19
]}

Gao, B. ^{[1
,2
,3
,5
]}

Gao, C. D. ^{[20
]}

Gao, Q. ^{[27
]}

机构：

[1] Chinese Acad Sci, Key Lab Particle Astrophys, Beijing 100049, Peoples R China

[2] Chinese Acad Sci, Expt Phys Div, Beijing 100049, Peoples R China

[3] Chinese Acad Sci, Ctr Comp, Inst High Energy Phys, Beijing 100049, Peoples R China

[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[5] TIANFU Cosm Ray Res Ctr, Chengdu, Sichuan, Peoples R China

[6] State Key Lab Particle Detect & Elect, Beijing, Peoples R China

[7] Univ Sci & Technol China, Hefei 230026, Peoples R China

[8] Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China

[9] Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China

[10] Chinese Acad Sci, Natl Space Sci Ctr, Beijing 100190, Peoples R China

[11] Peking Univ, Sch Phys, Beijing 100871, Peoples R China

[12] Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Peoples R China

[13] Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082, Peoples R China

[14] Sun Yat Sen Univ, Sch Phys Guangzhou, Zhuhai 519082, Peoples R China

[15] Guangxi Univ, Sch Phys Sci & Technol, Nanning 530004, Peoples R China

[16] Hebei Normal Univ, Shijiazhuang 050024, Hebei, Peoples R China

[17] Zhengzhou Univ, Sch Phys & Microelect, Zhengzhou 450001, Peoples R China

[18] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Peoples R China

[19] Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210023, Peoples R China

[20] Shandong Univ, Inst Frontier & Interdisciplinary Sci, Qingdao 266237, Peoples R China

[21] Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China

[22] Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Shanghai 200240, Peoples R China

[23] Shanghai Jiao Tong Univ, Sch Phys & Astron, Shanghai 200240, Peoples R China

[24] Southwest Jiaotong Univ, Sch Phys Sci & Technol, Chengdu 610031, Peoples R China

[25] Southwest Jiaotong Univ, Sch Informat Sci & Technol, Chengdu 610031, Peoples R China

[26] Sichuan Univ, Coll Phys, Chengdu 610065, Peoples R China

[27] Tibet Univ, Minist Educ, Key Lab Cosm Rays, Lhasa 850000, Peoples R China

[28] Wuhan Univ, Sch Phys & Technol, Wuhan 430072, Peoples R China

[29] Yunnan Univ, Sch Phys & Astron, Kunming 650091, Yunnan, Peoples R China

[30] Chinese Acad Sci, Yunnan Observ, Kunming 650216, Yunnan, Peoples R China

[31] Dublin Inst Adv Studies, 31 Fitzwilliam Pl, Dublin 2, Ireland

[32] Max Planck Inst Nucl Phys, POB 103980, D-69029 Heidelberg, Germany

[33] Univ Napoli Federico II, Dipartimento Fis, Complesso Univ Monte St Angelo,Via Cinthia, I-80126 Naples, Italy

[34] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

[35] Moscow Inst Phys & Technol, Moscow 141700, Russia

[36] Univ Geneva, Dept Phys Nucl & Corpusculaire, Fac Sci, 24 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland

[37] Mahidol Univ, Fac Sci, Dept Phys, Bangkok 10400, Thailand

来源：

CHINESE PHYSICS C | 2021年 / 45卷 / 08期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

LHAASO-WCDA; Crab Nebula; angular resolution; spectral energy distribution; TEV; SPECTRUM; TIBET; ENERGY;

D O I：

10.1088/1674-1137/ac041b

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

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 sigma. 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 degrees at 1 TeV and better than 0.2 degrees above 6 TeV, with a pointing accuracy better than 0.05 degrees. 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.

引用

页数：16

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