The first direct dynamical detection of a black hole in a young massive cluster
A black hole detected in the young massive LMC cluster NGC 1850
We report the detection of a black hole () in the myr-old massive cluster in the large magellanic cloud.
It is in a binary system with a main-sequence turn-off star (4.9 0.4) which is starting to fill its roche lobe and becoming distorted.
Using 17epochs of observations we detected radial velocity variations associated to the target star, linked to the ellipsoidal ellipsoidalvariations measured by ogle-iv in the optical bands.
Under the assumption of a semi-detached system, the simultaneous modelling of radial velocity and lightcurves constraints the orbital inclination of the binary to resulting in a true mass of the unseen companion of .
This represents the first direct dynamicaldetection 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.
S. Saracino, S. Kamann, M. G. Guarcello, C. Usher, N. Bastian, I. Cabrera-Ziri, M. Gieles, S. Dreizler, G. S. Da Costa, T.-O. Husser, V. Hénault-Brunet