Dynamics of massive stellar black holes in young star clusters and the displacement of ultra-luminous X-ray sources

Abstract

In low-metallicity environments, massive stars might avoid supernova explosion and directly collapse, forming massive (~25-80 solar masses) stellar black holes (MSBHs), at the end of their life. MSBHs, when hosted in young massive clusters, are expected to form binaries and to strongly interact with stars, mainly via three-body encounters. We simulate various realizations of young star clusters hosting MSBHs in hard binaries with massive stars. We show that a large fraction (~44 per cent) of MSBH binaries are ejected on a short timescale (<=10 Myr). The offset of the ejected MSBHs with respect to the parent cluster is consistent with observations of X-ray binaries and ultra-luminous X-ray sources. Furthermore, three-body encounters change the properties of MSBH binaries: the semi-major axis changes by <=50 per cent and the eccentricity of the system generally increases. We shortly discuss the implications of our simulations on the formation of high-mass X-ray binaries hosting MSBHs.

10 pages, 9 figures, accepted for publication in MNRAS

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• On the association of the ultraluminous X-ray sources in the Antennae galaxies with young stellar clusters
• Stellar-mass black holes in young massive and open stellar clusters and their role in gravitational-wave generation III: dissecting black hole dynamics
• The host galaxies of double compact objects merging in the local Universe
• Do open star clusters evolve toward energy equipartition?
• Roche-lobe overflow systems powered by black holes in young star clusters: the importance of dynamical exchanges
• Evolution of the spectral curvature in the ULX Holmberg II X-1
• Discovery of a 6.4 h black hole binary in NGC 4490
• The black hole retention fraction in star clusters
• The ultraluminous X-ray source HoII X-1: kinematic evidence of its escape from the cluster
• The ultraluminous X-ray source NGC 5643 ULX1: a large stellar mass black hole accreting at super-Eddington rates?
• Black Holes In Young Stellar Clusters
• The Local Environment of Ultraluminous X-ray Sources Viewed by XMM Newton's Optical Monitor
• Chandra Observations of the Collisional Ring Galaxy NGC 922
• Superwind evolution: the young starburst-driven wind galaxy NGC 2782
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