A 4.46 solar-mass black hole is found in a 94-year eccentric orbit with a main-sequence turnoff star in ω Centauri via 23-year astrometric monitoring.
An analytical approach to binary populations in globular clusters
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abstract
Globular clusters (GCs) display much lower binary fractions than found among main-sequence stars in the solar neighborhood. The physical cause of this difference is debatable: does it reflect different star formation outcomes at low metallicity and/or high density, the dynamical processing of primordial binaries over cluster lifetimes, or a combination of the two? Starting from the assumption that the initial binary distribution in GCs is the same as the binary distribution observed in the solar neighborhood, we show with straightforward analytical calculations that the dynamical dissolution of "soft" primordial binaries can fully explain the main-sequence binary fractions in present-day GCs. We validate our estimates against a detailed N-body simulation with the Cluster Monte Carlo code. Adopting the view that the observed binary fraction in a given cluster constrains the location of the hard/soft boundary at birth, we infer that surviving Milky Way GCs had a similar distribution of birth radii to young massive clusters in the local universe. Our findings underscore the crucial role of stellar black holes (through "black hole burning") in sculpting GC binary populations and reinforce the need for realistic initial conditions in theoretical modeling of GC dynamics.
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UNVERDICTED 3representative citing papers
Simulations identify black hole-giant collisions as the main formation channel for ultracompact black hole-white dwarf binaries in globular clusters, with mock catalogs suggesting order-one LISA-detectable sources in the Milky Way.
LILA can detect IMBH binaries at redshifts 20-30, IMRIs, and provide months-to-years early warnings with high-SNR events for gravity tests.
citing papers explorer
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A Long Period Stellar-Mass Black Hole Binary in $\omega$ Centauri
A 4.46 solar-mass black hole is found in a 94-year eccentric orbit with a main-sequence turnoff star in ω Centauri via 23-year astrometric monitoring.
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Formation of Black Hole-White Dwarf X-ray Binaries in Globular Clusters
Simulations identify black hole-giant collisions as the main formation channel for ultracompact black hole-white dwarf binaries in globular clusters, with mock catalogs suggesting order-one LISA-detectable sources in the Milky Way.
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Black Hole Binary Detection Landscape for the Laser Interferometer Lunar Antenna (LILA): Signal-to-Noise Calculations & Science Cases
LILA can detect IMBH binaries at redshifts 20-30, IMRIs, and provide months-to-years early warnings with high-SNR events for gravity tests.