S2-star dynamics probing the galaxy core cluster N. Galikyan, Sh. Khlghatyan, A. A. Kocharyan and V. G. Gurzadyan Eur. Phys. J. Plus, 139 9 (2024) 821 Published online: 13 September 2024 DOI: 10.1140/epjp/s13360-024-05619-9