Optimization of performance of the KM2A full array using the Crab Nebula*

IF 3.6 2区物理与天体物理 Q1 PHYSICS, NUCLEAR 中国物理C Pub Date : 2024-05-31 DOI:10.1088/1674-1137/ad2e82

Zhen Cao, 臻曹, F. Aharonian, Q. An, 琪安, Axikegu, 克古阿西, Y.X. Bai, 云翔白, Y.W. Bao, 逸炜包, D. Bastieri, X.J. Bi, 效军毕, Y.J. Bi, 玉江毕, J.T. Cai, 金庭蔡, Q. Cao, 晴曹, W.Y. Cao, 文羽曹, Zhe Cao, 喆曹, J. Chang, 进常, J.F. Chang, 劲帆常, A.M. Chen, 尚明陈, E.S. Chen, 恩生陈, Liang Chen, 亮陈, Lin Chen, 林陈, Long Chen, 龙陈, M.J. Chen, 明君陈, M.L. Chen, 玛丽陈, Q.H. Chen, 起辉陈, S.H. Chen, 素弘陈, T.L. Chen, 天禄陈, Y. Chen, 阳陈, N. Cheng, 宁程, Y.D. Cheng, 耀东程, M.Y. Cui, 明阳崔, S.W. Cui, 树旺崔, X.H. Cui, 晓红崔, Y.D. Cui, 昱东崔, B.Z. Dai, 本忠戴, H.L. Dai, 洪亮代, Z.G. Dai, 子高戴, Danzengluobu, 罗布单增, D. della Volpe, X.Q. Dong, 绪强董, K.K. Duan, 凯凯段, J.H. Fan, 军辉樊, Y.Z. Fan, 一中范, J. Fang, 军方, K. Fang, 堃方, C.F. Feng, 存峰冯, L. Feng, 莉封, S.H. Feng, 少辉冯, X.T. Feng, 晓婷丰, Y.L. Feng, 有亮冯, S. Gabici, B. Gao, 博高, C.D. Gao, 川东高, L.Q. Gao, 林青高, Q. Gao, 启高, W. Gao, 卫高, W.K. Gao, 伟康高, M.M. Ge, 茂茂葛, L.S. Geng, 利斯耿, G. Giacinti, G.H. Gong, 光华龚, Q.B. Gou, 全补苟, M.H. Gu, 旻皓顾, F.L. Guo, 福来郭, X.L. Guo, 晓磊郭, Y.Q...

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Abstract

The full array of the Large High Altitude Air Shower Observatory (LHAASO) has been in operation since July 2021. For its kilometer-square array (KM2A), we optimized the selection criteria for very high and ultra-high energy γ-rays using data collected from August 2021 to August 2022, resulting in an improvement in significance of the detection in the Crab Nebula of approximately 15%, compared with that of previous cuts. With the implementation of these new selection criteria, the angular resolution was also significantly improved by approximately 10% at tens of TeV. Other aspects of the full KM2A array performance, such as the pointing error, were also calibrated using the Crab Nebula. The resulting energy spectrum of the Crab Nebula in the energy range of 10-1000 TeV are well fitted by a log-parabola model, which is consistent with the previous results from LHAASO and other experiments.

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利用蟹状星云优化 KM2A 全阵列的性能*

大型高空气流淋浴观测台（LHAASO）的全阵列已于 2021 年 7 月开始运行。对于其千米方阵（KM2A），我们利用2021年8月至2022年8月收集的数据优化了对极高能和超高能γ射线的选择标准，结果蟹状星云的探测显著性比以前的切割提高了约15%。随着这些新选择标准的实施，在数十 TeV 的角度分辨率也显著提高了约 10%。KM2A全阵列性能的其他方面，例如指向误差，也利用蟹状星云进行了校准。蟹状星云在10-1000 TeV能量范围内的能谱结果被对数抛物线模型很好地拟合，这与LHAASO和其他实验之前的结果是一致的。

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来源期刊

中国物理C 物理-物理：核物理

CiteScore

6.50

自引率

8.30%

发文量

8976

审稿时长

1.3 months

期刊介绍： Chinese Physics C covers the latest developments and achievements in the theory, experiment and applications of: Particle physics; Nuclear physics; Particle and nuclear astrophysics; Cosmology; Accelerator physics. The journal publishes original research papers, letters and reviews. The Letters section covers short reports on the latest important scientific results, published as quickly as possible. Such breakthrough research articles are a high priority for publication. The Editorial Board is composed of about fifty distinguished physicists, who are responsible for the review of submitted papers and who ensure the scientific quality of the journal. The journal has been awarded the Chinese Academy of Sciences ‘Excellent Journal’ award multiple times, and is recognized as one of China''s top one hundred key scientific periodicals by the General Administration of News and Publications.