Repeated mergers of black hole binaries: implications for GW190521

Abstract

The gravitational wave event GW190521 involves the merger of two black holes of $\sim 85{\text{M}}_{\odot }$ and $\sim 66{\text{M}}_{\odot }$ forming an intermediate-mass black hole (IMBH) of mass $\sim 142{\text{M}}_{\odot }$. Both progenitors are challenging to explain within standard stellar evolution as they are within the upper black-hole mass gap. We propose a dynamical formation pathway for this IMBH based on multiple mergers in the core of a globular cluster. We identify such scenarios from analysis of a set of 58 N-body simulations using \texttt{NBODY6-gpu}. In one of our simulations, we observe a stellar black hole undergoing a chain of seven binary mergers within 6 Gyr, attaining a final mass of $97.8{\text{M}}_{\odot }$. We discuss the dynamical interactions that lead to the final IMBH product, as well as the evolution of the black hole population in that simulation. We explore statistically the effects of gravitational recoil on the viability of such hierarchical mergers. From the analysis of all 58 simulations we observe additional smaller chains, tentatively inferring that an IMBH formation through hierarchical mergers is expected in the lifetime of a median mass globular cluster with probability $0.01\lesssim p\lesssim 0.1$ without gravitational merger recoil. Using this order-of-magnitude estimate we show our results are broadly consistent with the rate implied by GW190521, assuming that gravitational recoil ejection of progenitors has a low probability. We discuss implications for future gravitational wave detections, emphasising the importance of studying such formation pathways for BHs within the upper mass gap as a means to constrain such modelling.

arXiv comment15 pages, 5 figures, Published in The Astrophysical Journal (url = https://dx.doi.org/10.3847/1538-4357/ac9d95)

References in corpus (81)

• Observation of Gravitational Waves from a Binary Black Hole Merger
• On the variation of the Initial Mass Function
• Modules for Experiments in Stellar Astrophysics (MESA)
• Cosmic Star Formation History
• GWTC-1: A Gravitational-Wave Transient Catalog of Compact Binary Mergers Observed by LIGO and Virgo during the First and Second Observing Runs
• GW151226: Observation of Gravitational Waves from a 22-Solar-Mass Binary Black Hole Coalescence
• GW170104: Observation of a 50-Solar-Mass Binary Black Hole Coalescence at Redshift 0.2
• How Massive Single Stars End their Life
• GW190814: Gravitational Waves from the Coalescence of a 23 M${}_{\odot }$ Black Hole with a 2.6 M${}_{\odot }$ Compact Object
• Comprehensive analytic formulae for stellar evolution as a function of mass and metallicity
• GW190425: Observation of a Compact Binary Coalescence with Total Mass $\sim 3.4M_{\odot }$
• A statistical study of 233 pulsar proper motions
• GW170608: Observation of a 19-solar-mass Binary Black Hole Coalescence
• Binary Black Hole Mergers in the first Advanced LIGO Observing Run
• Compact Object Modeling with the StarTrack Population Synthesis Code
• Pulsational Pair-Instability Supernovae
• GW190412: Observation of a Binary-Black-Hole Coalescence with Asymmetric Masses
• Properties and astrophysical implications of the 150 Msun binary black hole merger GW190521
• On The Maximum Mass of Stellar Black Holes
• The Gravitational Million-Body Problem
• Large Merger Recoils and Spin Flips From Generic Black-Hole Binaries
• The Effect of Pair-Instability Mass Loss on Black Hole Mergers
• Mind the gap: The location of the lower edge of the pair instability supernovae black hole mass gap
• The evolutionary roads leading to low effective spins, high black hole masses, and O1/O2 rates of LIGO/Virgo binary black holes
• Very massive stars, pair-instability supernovae and intermediate-mass black holes with the SEVN code
• Black Holes: The Next Generation -- Repeated Mergers in Dense Star Clusters and their Gravitational-Wave Properties
• Binary Mergers and Growth of Black Holes in Dense Star Clusters
• Are merging black holes born from stellar collapse or previous mergers?
• Hierarchical Black Hole Mergers in Active Galactic Nuclei
• Merging black hole binaries with the SEVN code
• Stellar-mass black holes in star clusters: implications for gravitational wave radiation
• Are LIGO's Black Holes Made From Smaller Black Holes?
• Accelerating NBODY6 with Graphics Processing Units
• The Evolution of Massive Helium Stars Including Mass Loss
• Black hole growth through hierarchical black hole mergers in dense star clusters: implications for gravitational wave detections
• On the final spin from the coalescence of two black holes
• Constraints from gravitational wave detections of binary black hole mergers on the ${}^{12}\mathrm{C}{\left(\alpha ,\gamma \right)}^{16}\mathrm{O}$ rate
• Modeling Dense Star Clusters in the Milky Way and Beyond with the $\text{CMC}$ Cluster Catalog
• Pulsational pair-instability supernovae in very close binaries
• Remnant Masses, Spins and Recoils from the Merger of Generic Black-Hole Binaries
• Astrophysical Constraints on Large Extra Dimensions
• Natal Kicks of Stellar-Mass Black Holes by Asymmetric Mass Ejection in Fallback Supernovae
• Formation of GW190521 from stellar evolution: the impact of the hydrogen-rich envelope, dredge-up and ${}^{12}$C($\alpha$, $\gamma$)${}^{16}$O rate on the pair-instability black hole mass gap
• On the Rate of Neutron Star Binary Mergers from Globular Clusters
• Impact of the Rotation and Compactness of Progenitors on the Mass of Black Holes
• Populating the upper black hole mass gap through stellar collisions in young star clusters
• Dynamical formation signatures of black hole binaries in the first detected mergers by LIGO
• Binary black holes in the pair-instability mass gap
• BSE versus StarTrack: implementations of new wind, remnant-formation, and natal-kick schemes in NBODY7 and their astrophysical consequences
• Retention of Stellar-Mass Black Holes in Globular Clusters
• Distance measures in gravitational-wave astrophysics and cosmology
• No Energy Equipartition in Globular Clusters
• Black hole genealogy: Identifying hierarchical mergers with gravitational waves
• Formation of Globular Cluster Systems: From Dwarf Galaxies to Giants
• Binary Black Holes in Dense Star Clusters: Exploring the Theoretical Uncertainties
• Stellar-mass black holes in young massive and open stellar clusters IV: updated stellar-evolutionary and black hole spin models and comparisons with the LIGO-Virgo O1/O2 merger-event data
• Intermediate Mass Black Hole Formation in compact Young Massive Star Clusters
• Pulsational Pair-instability Supernovae. I. Pre-collapse Evolution and Pulsational Mass Ejection
• Black Hole Coagulation: Modeling Hierarchical Mergers in Black Hole Populations
• Constraining the formation of black-holes in short-period Black-Hole Low-Mass X-ray Binaries
• The impact of stellar rotation on the black hole mass-gap from pair-instability supernovae
• Sensitivity of the lower-edge of the pair instability black hole mass gap to the treatment of time dependent convection
• Beyond the Standard Model Explanations of GW190521
• Dynamical evolution of stellar-mass black holes in dense stellar clusters: estimate for merger rate of binary black holes originating from globular clusters
• The mass gap, the spin gap, and the origin of merging binary black holes
• The Close Stellar Companions to Intermediate Mass Black Holes
• Dynamical Interactions and the Black Hole Merger Rate of the Universe
• Modeling the remnant mass, spin, and recoil from unequal-mass, precessing black-hole binaries: The Intermediate Mass Ratio Regime
• A General Formula for Black Hole Gravitational Wave Kicks
• MOCCA-SURVEY Database I: Assessing GW kick retention fractions for BH-BH mergers in globular clusters
• Topology of Black Hole Binary-Single Interactions
• Formation and merging of Mass Gap Black Holes in Gravitational Wave Merger Events from Wide Hierarchical Quadruple Systems
• Astrophysical implications of GW190412 as a remnant of a previous black-hole merger
• The Impact of Neutrino Magnetic Moments on the Evolution of Massive Stars
• GW170817A as a Hierarchical Black Hole Merger
• Populating the Black Hole Mass Gaps In Stellar Clusters: General Relations and Upper Limits
• Binary black hole mergers from young massive clusters in the pair-instability supernova mass gap
• Formation of Low-mass Black Holes and Single Millisecond Pulsars in Globular Clusters
• Dynamically Formed Black Hole Binaries: In-Cluster Versus Ejected Mergers
• Wandering off the centre: a characterization of the random motion of intermediate-mass black holes in star clusters
• Correlation Between Mass Segregation and Structural Concentration in Relaxed Stellar Clusters

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• Comparing hierarchical black hole mergers in star clusters and active galactic nuclei
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