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As part of our massive spectroscopic survey of 25 Galactic globular clusterswith MUSE, we performed multiple epoch observations of NGC 3201 with the aim ofconstraining the binary fraction. In this cluster, we found one curious star atthe main-sequence turn-off with radial velocity variations of the order of 100km/s, indicating the membership to a binary system with an unseen componentsince no other variations appear in the spectra. Using an adapted variant ofthe generalized Lomb-Scargle periodogram, we could calculate the orbitalparameters and found the companion to be a detached stellar-mass black holewith a minimum mass of 4.36 $\pm$ 0.41 solar masses. The result is an importantconstraint for binary and black hole evolution models in globular clusters aswell as in the context of gravitational wave sources.

A detached stellar-mass black hole candidate in the globular cluster NGC 3201