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

Benjamin GiesersInstitut für Astrophysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, GermanyS. DreizlerInstitut für Astrophysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, GermanyTim-Oliver HusserInstitut für Astrophysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, GermanySebastian KamannAstrophysics Research Institute, Liverpool John Moores University, 146 Brownlow Hill, Liverpool L3 5RF, UKG. Anglada‐EscudéSchool of Physics and Astronomy, Queen Mary University of London, 327 Mile End Road, E1 4NS London, UKJ. BrinchmannInstituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, PT4150-762 Porto, PortugalC. M. CarolloInstitute for Astronomy, Swiss Federal Institute of Technology (ETH Zurich), CH-8093 Zurich, SwitzerlandMartin M. RothLeibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, GermanyPeter M. WeilbacherLeibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, GermanyL. WisotzkiLeibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany

2017en

ABI

Annotatsiya

Abstract As part of our massive spectroscopic survey of 25 Galactic globular clusters with MUSE, we performed multiple epoch observations of NGC 3201 with the aim of constraining the binary fraction. In this cluster, we found one curious star at the main-sequence turn-off with radial velocity variations of the order of 100 km s− 1, indicating the membership to a binary system with an unseen component since no other variations appear in the spectra. Using an adapted variant of the generalized Lomb–Scargle periodogram, we could calculate the orbital parameters and found the companion to be a detached stellar-mass black hole with a minimum mass of 4.36 ± 0.41 M⊙. The result is an important constraint for binary and black hole evolution models in globular clusters as well as in the context of gravitational wave sources.

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Identifikatorlar

DOI: 10.1093/mnrasl/slx203

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