A black hole detected in the young massive LMC cluster NGC 1850

Saracino, S. (author)

Kamann, S. (author)

Guarcello, M. G. (author)

Usher, Christopher (author): Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)

Bastian, N. (author)

Cabrera-Ziri, I. (author)

Gieles, M. (author)

Dreizler, S. (author)

Da Costa, G. S. (author)

Husser, T.-O. (author)

Hénault-Brunet, V. (author)

(creator_code:org_t)

2021-11-11
2022
English.
In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 511:2, s. 2914-2924

Related links:: https://doi.org/10.1...; show more...; https://academic.oup...; https://urn.kb.se/re...; https://doi.org/10.1...; show less...

Abstract Subject headings

We report on the detection of a black hole (NGC 1850 BH1) in the ∼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 ± 0.4 M⊙), which is starting to fill its Roche lobe and is becoming distorted. Using 17 epochs of Very Large Telescope/Multi-Unit Spectroscopic Explorer observations, we detected radial velocity variations exceeding 300 km s−1 associated with the target star, linked to the ellipsoidal variations measured by the fourth phase of the Optical Gravitational Lensing Experiment in the optical bands. Under the assumption of a semidetached system, the simultaneous modelling of radial velocity and light curves constrains the orbital inclination of the binary to 38° ± 2°, resulting in a true mass of the unseen companion of 11.1+2.1−2.4M⊙11.1−2.4+2.1M⊙⁠. 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.

By the author/editor: Saracino, S.; Kamann, S.; Guarcello, M. G.; Usher, Christoph ...; Bastian, N.; Cabrera-Ziri, I.; show more...; Gieles, M.; Dreizler, S.; Da Costa, G. S.; Husser, T.-O.; Hénault-Brunet, ...; show less...

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