Highlights of LHAASO science results

Z. Cao
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引用次数: 3

Abstract

The Large High Altitude Air Shower Observatory (LHAASO) is a complex of extensive air shower (EAS) detector array for very-high energy and ultra-high energy γ-ray observation and cosmic ray studies. LHAASO was completed its construction and has been starting the full-duty operation in July 2021 at Mt Haizi 4,410 meters above sea level, China. With the data collected in 2020, LHAASO found a dozen UHE gamma-ray sources with high significance (> 7σ). Their energy spectra are found extended to about 1 PeV without obvious cut-off. LHAASO also recorded the unprecedent highest energy photon with the energy of 1.4 ± 0.13 PeV. These findings confirmed the existence of PeV particle accelerators in the Milk Way and opened up an era of UHE gamma-ray astronomy. LHAASO measured the energy spectrum of the Crab Nebula from 0.5 TeV up to 1.1 PeV for the first time. LHAASO achieved the absolute energy scale calibration in cosmic ray shower measurements at 21±6 TeV by measuring the Moon shadow drifting in the geo-magnetic field using WCDA. In this proceeding, we summarize the status of LHAASO experiment and highlight the γ-ray results and cosmic ray progresses.
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LHAASO科学成果亮点
大型高空气淋天文台(LHAASO)是一个大型气淋(EAS)探测器阵列的综合体,用于高能和超高能γ射线观测和宇宙射线研究。LHAASO于2021年7月在海拔4410米的中国海子山建成并开始全面运行。利用2020年收集的数据,LHAASO发现了12个高显著性(> 7σ)的UHE伽马射线源。它们的能谱扩展到1 PeV左右,没有明显的截止。LHAASO还记录到了前所未有的最高能量光子,能量为1.4±0.13 PeV。这些发现证实了银河系中PeV粒子加速器的存在,开启了UHE伽玛射线天文学的新纪元。LHAASO首次测量了蟹状星云从0.5 TeV到1.1 PeV的能谱。LHAASO通过WCDA测量月球阴影在地磁场中的漂移,实现了21±6 TeV宇宙射线雨测量的绝对能量尺度定标。本文综述了LHAASO实验的现状,重点介绍了γ射线和宇宙射线的研究进展。
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