2023, Suchkov, S. I., Arkhangelskaja, I. V., Arkhangelskiy, A. I., Chernysheva, I. V., Galper, A. M., Dalkarov, O. D., Kheymits, M. D., Korotkov, M. G., Leonov, A. A., Malinin, A. G., Mikhailov, V. V., Yurkin, Y. T., Архангельская, Ирина Владимировна, Архангельский, Андрей Игоревич, Чернышева, Ирина Вячеславовна, Далькаров, Олег Дмитриевич, Хеймиц, Максим Дмитриевич, Коротков, Михаил Геннадиевич, Леонов, Алексей Анатольевич, Малинин, Александр Геннадьевич, Михайлов, Владимир Владимирович, Юркин, Юрий Тихонович

The upcoming GAMMA-400 experiment will be implemented aboard the Russian astrophysical space observatory, which will be operating in a highly elliptical orbit over a period of 7 years to provide new data on gamma-ray emissions and cosmic-ray electron + positron fluxes, mainly from the galactic plane, the Galactic Center, and the Sun. The main observation mode will be a continuous point-source mode, with a duration of up to ~100 days. The GAMMA-400 gamma-ray telescope will study high-energy gamma-ray emissions of up to several TeV and cosmic-ray electrons + positrons up to 20 TeV. The GAMMA-400 telescope will have a high angular resolution, high energy and time resolutions, and a very good separation efficiency for separating gamma rays from the cosmic-ray background and the electrons + positrons from protons. A distinctive feature of the GAMMA-400 gamma-ray telescope is its wonderful angular resolution for energies of andgt;30 GeV (0.01° for Eγ = 100 GeV), which exceeds the resolutions of space-based and ground-based gamma-ray telescopes by a factor of 5–10. GAMMA-400 studies can reveal gamma-ray emissions from dark matter particles’ annihilation or decay, identify many unassociated, discrete sources, explore the extended sources’ structures, and improve the cosmic-ray electron + positron spectra data for energies of andgt;30 GeV.