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19.01.2022 / 13:00 / Zeuthen, Online
Physics colloquiumLHAASO and Its First Few Discoveries - Onset of the UHE Gamma-ray Astronomy
Prof. Zhen Cao (Institute of High Energy Physics, Chinese Academy of Sciences)
The Large High Altitude Air Shower Observatory (LHAASO) as the largest ground based Gamma Ray detector array is built up. The full array has been operated for months. Many VHE gamma ray sources have been observed including well known sources such as the Crab and Mrk421. 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 for the 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. LHAASO could separate individual species of charged cosmic rays, such as protons or iron nuclei, at energies around the “knee”. The knees of the spectra of those particles are expected to be clearly identified with sufficient statistics. The highest energy photons provide opportunities of checking for validity of fundamental rules, such as the Lorentz Invariance.
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