Black Holes merging with Low Mass Gap Objects inside Globular Clusters

Abstract

Recently, the LIGO-Virgo collaborations have reported the coalescence of a binary involving a black hole and a low-mass gap object (LMGO) with mass in the range $\sim 2.5-5M_{\odot }$. Such detections, challenge our understanding of the black hole and neutron star mass spectrum, as well as how such binaries evolve especially if isolated. In this work we study the dynamical formation of compact object pairs, via multiple binary-single exchanges that occur at the cores of globular clusters. We start with a population of binary star systems, which interact with single compact objects as first generation black holes and LMGOs. We evaluate the rate of exchange interactions leading to the formation of compact object binaries. Our calculations include all possible types of binary-single exchange interactions and also the interactions of individual stars with compact object binaries that can evolve their orbital properties, leading to their eventual merger. We perform our calculations for the full range of the observed Milky Way globular cluster environments. We find that the exchanges are efficient in forming hard compact object binaries at the cores of dense astrophysical stellar environments. Furthermore, if the population size of the LMGOs is related to that of neutron stars, the inferred merger rate density of black hole-LMGO binaries inside globular clusters in the local Universe is estimated to be about $0.1{\text{Gpc}}^{-3}{\text{yr}}^{-1}$.

arXiv comment18 pages, 10 figures and 3 appendices

References in corpus (85)

• Planck 2015 results. XIII. Cosmological parameters
• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• GW190814: Gravitational Waves from the Coalescence of a 23 M${}_{\odot }$ Black Hole with a 2.6 M${}_{\odot }$ Compact Object
• The Initial Mass Function of Stars: Evidence for Uniformity in Variable Systems
• GW190425: Observation of a Compact Binary Coalescence with Total Mass $\sim 3.4M_{\odot }$
• Masses, Radii, and Equation of State of Neutron Stars
• Binary Black Hole Population Properties Inferred from the First and Second Observing Runs of Advanced LIGO and Advanced Virgo
• The runaway growth of intermediate-mass black holes in dense star clusters
• Binary Black Hole Mergers from Globular Clusters: Masses, Merger Rates, and the Impact of Stellar Evolution
• The dynamical evolution of massive black hole binaries - I. Hardening in a fixed stellar background
• Production of Intermediate-Mass Black Holes in Globular Clusters
• The Pulsar Kick Velocity Distribution
• Formation of Massive Black Holes in Dense Star Clusters. I. Mass Segregation and Core Collapse
• Merging black hole binaries in galactic nuclei: implications for advanced-LIGO detections
• Progenitors of gravitational wave mergers: Binary evolution with the stellar grid-based code ComBinE
• Modeling the Metallicity Distribution of Globular Clusters
• The Mass Distribution of Stellar Black Holes
• Binary Mergers and Growth of Black Holes in Dense Star Clusters
• Most Black Holes are Born Very Slowly Rotating
• The Dynamical Evolution of Stellar Black Holes in Globular Clusters
• Discovery of a Candidate Black Hole - Giant Star Binary System in the Galactic Field
• Missing Black Holes Unveil The Supernova Explosion Mechanism
• Four-Body Effects in Globular Cluster Black Hole Coalescence
• Black hole mergers and blue stragglers from hierarchical triples formed in globular clusters
• Black hole growth through hierarchical black hole mergers in dense star clusters: implications for gravitational wave detections
• Interaction of massive black hole binaries with their stellar environment: I. Ejection of hypervelocity stars
• Dynamical evolution of black hole sub-systems in idealised star clusters
• Modeling Dense Star Clusters in the Milky Way and Beyond with the $\text{CMC}$ Cluster Catalog
• Where are LIGO's Big Black Holes?
• Extended Gravity Description for the GW190814 Supermassive Neutron Star
• Reconstructing phenomenological distributions of compact binaries via gravitational wave observations
• A lower bound on the maximum mass if the secondary in GW190814 was once a rapidly spinning neutron star
• GW190814 as a massive rapidly-rotating neutron star with exotic degrees of freedom
• On the Rate of Neutron Star Binary Mergers from Globular Clusters
• Scattering experiments meet N-body I: a practical recipe for the evolution of massive black hole binaries in stellar environments
• Neutron Star Equation of State in light of GW190814
• Exploring the Lower Mass Gap and Unequal Mass Regime in Compact Binary Evolution
• Further insight into gravitational recoil
• Was GW190814 a black hole -- strange quark star system?
• No Energy Equipartition in Globular Clusters
• Evidence for primordial black hole dark matter from LIGO/Virgo merger rates
• On the maximum mass of neutron stars and GW190814
• The Black Hole Mass Function from Gravitational Wave Measurements
• Repeated mergers and ejection of black holes within nuclear star clusters
• On the Origin of GW190521-like events from repeated black hole mergers in star clusters
• Detection Rate Estimates of Gravity-waves Emitted During Parabolic Encounters of Stellar Black Holes in Globular Clusters
• On the nature of GW190814 and its impact on the understanding of supranuclear matter
• GW190814's secondary component with mass $(2.50-2.67)$ M${}_{\odot }$ as a super-fast pulsar
• The Low Effective Spin of Binary Black Holes and Implications for Individual Gravitational-Wave Events
• A New Catalog of Globular Clusters in the Milky Way
• How initial size governs core collapse in globular clusters
• A comprehensive Nbody study of mass segregation in star clusters: Energy equipartition and escape
• Binary black hole mergers: formation and populations
• GW190814: Spin and equation of state of a neutron star companion
• Dynamics of black hole - neutron star binaries in young star clusters
• The mass gap, the spin gap, and the origin of merging binary black holes
• Black Hole Formation in the Lower Mass Gap through Mergers and Accretion in AGN Disks
• On the formation of GW190814
• Probing the presence of a single or binary black hole in the globular cluster NGC 6752 with pulsar dynamics
• Merging Black Holes in the Low-mass and High-mass Gaps from 2+2 Quadruple Systems
• Test for the Origin of Solar Mass Black Holes
• GW190814: On the properties of the secondary component of the binary
• The Formation of Stellar Black Holes
• Black holes in the low mass gap: Implications for gravitational wave observations
• Bayesian analysis of the spin distribution of LIGO/Virgo black holes
• Could the 2.6 $M_{\odot }$ object in GW190814 be a primordial black hole?
• QCD color superconductivity in compact stars: color-flavor locked quark star candidate for the gravitational-wave signal GW190814
• Dissecting the properties of neutron star - black hole mergers originating in dense star clusters
• Formation and merging of Mass Gap Black Holes in Gravitational Wave Merger Events from Wide Hierarchical Quadruple Systems
• Does NGC 6397 contain an intermediate-mass black hole or a more diffuse inner subcluster?
• Populating the Black Hole Mass Gaps In Stellar Clusters: General Relations and Upper Limits
• Formation of mass gap objects in highly asymmetric mergers
• The Astro-Primordial Black Hole Merger Rates: a Reappraisal
• Demographics of neutron stars in young massive and open clusters
• Final compact remnants in core-collapse supernovae from 20 to 40 $M_{\odot }$: the lower mass gap
• Hadron-Quark phase transition in the context of GW190814
• Dynamical formation of the GW190814 merger
• Limits on Runaway Growth of Intermediate Mass Black Holes from Advanced LIGO
• Binary--single-star scattering VII. Hard Binary Exchange Cross Sections for Arbitrary Mass Ratios: Numerical Results and Semi-Analytic Fits
• Interpreting LIGO/Virgo "Mass-Gap" events as lensed Neutron Star-Black Hole binaries
• Constraint on hybrid stars with gravitational wave events
• Evaluating the Merger Rate of Binary Black Holes from Direct Captures and Third-Body Soft Interactions Using the Milky Way Globular Clusters
• How black holes get their kicks: Radiation recoil in binary black hole mergers
• Outliers in the LIGO Black Hole Mass Function from Coagulation in Dense Clusters
• Modified Gravity (MOG) and Heavy Neutron Star in Mass Gap

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