发稿时间:2021-09-13浏览次数:10

USTC Astronomy Colloquium Series: 2021 Fall
LHAASO and Its First Few Discoveries—— Onset of the UHE -ray Astronomy
曹臻  研究员
中国科学院高能物理研究所
2021/9/14, 4:00pm , the 19th-floor Observatory Hall
报告人:
曹臻教授,1994年在中科院北京高能所获物理学博士学位。1994-2003先后在美国俄勒冈大学物理系、犹他大学物理系从事重离子物理的理论研究和超高能宇宙线HIRES实验研究,2004年入选中国科学院“引进国外杰出人才”计划,任中意合作ARGO-YBJ实验中方发言人,担任多项基金委重大国际合作项目、重点项目和973项目负责人。2015年起,任“高海拔宇宙线观测站( LHAASO)”项目经理、首席科学家,2014年至今,任国际纯粹及应用物理联合会(IUPAP) 的〃天体粒子物理国际委员会(WG-10)〃委员、〃天体粒子物理委员会(C4)〃委员。现为高能所粒子天体物理中心研究员。1994年至今,活跃于国内外宇宙线和伽马天文领域,在国际专业刊物发表了 130多篇科学论文,总引用率超过5,500次。
摘要:
The Large High Altitude Air Shower Observatory (LHAASO) as the largest ground based Gamma Ray detector array is built up. The 3/4 array has been operated for months. Many VHE gamma ray sources has been observed including well known sources such as the Crab and Mkr421. With many sources found having strong emission of gamma rays in UHE(> 0.1 PeV) band, LHAASO starts the era of the UHE gamma ray astronomy. With its unprecedented sensitivity at energies above 10 TeV and extremely high background rejection capability, super-PeV gamma-like events, including the record high energy of 1.4 PeV, are detected first time in history. With also measured SEDs of several galactic gamma sources above 0.1 PeV, LHAASO reveals that our galaxy is full of PeVatrons. The extreme features of the electron PeVatron inside the Crab pose strong challenges to models and even more fundamental theories. Those exciting discoveries enable an exploring for hadronic PeVatrons which are origins of cosmic rays. With the operation of the full scale LHAASO array starting now, more exciting observational results will be highly anticipated.