Saracino, S.S.SaracinoKamann, S.S.KamannGUARCELLO, Mario GiuseppeMario GiuseppeGUARCELLOUsher, C.C.UsherBastian, N.N.BastianCabrera-Ziri, I.I.Cabrera-ZiriGieles, M.M.GielesDreizler, S.S.DreizlerDa Costa, G. S.G. S.Da CostaHusser, T. -O.T. -O.HusserHénault-Brunet, V.V.Hénault-Brunet2025-02-062025-02-0620220035-8711http://hdl.handle.net/20.500.12386/35826We report the detection of a black hole (NGC 1850 BH1) in the $\sim$100 Myr-old massive cluster NGC~1850 in the Large Magellanic Cloud. It is in a binary system with a main-sequence turn-off star (4.9 $\pm$ 0.4 M${_\odot}$), which is starting to fill its Roche Lobe and becoming distorted. Using 17 epochs of VLT/MUSE observations we detected radial velocity variations exceeding 300 km/s associated to the target star, linked to the ellipsoidal variations measured by OGLE-IV in the optical bands. Under the assumption of a semi-detached system, the simultaneous modelling of radial velocity and light curves constraints the orbital inclination of the binary to ($38 \pm 2$)$^{\circ}$, resulting in a true mass of the unseen companion of $11.1_{-2.4}^{+2.1}$ $M_{\odot}$. This represents the first direct dynamical detection of a black hole in a young massive cluster, opening up the possibility of studying the initial mass function and the early dynamical evolution of such compact objects in high-density environments.STAMPAenArticle10.1093/mnras/stab31592-s2.0-85125502992000767859900001http://arxiv.org/abs/2111.06506v1https://academic.oup.com/mnras/article/511/2/2914/6424300?login=false2022MNRAS.511.2914SFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering