Black Hole Formation in the Lower Mass Gap through Mergers and Accretion in AGN Disks

Abstract

The heaviest neutron stars and lightest black holes expected to be produced by stellar evolution leave the mass-range $2.2$ M${}_{\odot }\lesssim m\lesssim 5$ M${}_{\odot }$ largely unpopulated. Objects found in this so-called lower mass gap likely originate from a distinct astrophysical process. Such an object, with mass $2.6$ M${}_{\odot }$ was recently detected in the binary merger GW190814 through gravitational waves by LIGO/Virgo. Here we show that black holes in the mass gap are naturally assembled through mergers and accretion in AGN disks, and can subsequently participate in additional mergers. We compute the properties of AGN-assisted mergers involving neutron stars and black holes, accounting for accretion. We find that mergers in which one of the objects is in the lower mass gap represent up to $4$% of AGN-assisted mergers detectable by LIGO/Virgo. The lighter object of GW190814, with mass $2.6$ M${}_{\odot }$, could have grown in an AGN disk through accretion. We find that the unexpectedly high total mass of 3.4 M${}_{\odot }$ observed in the neutron star merger GW190425 may also be due to accretion in an AGN disk.

arXiv comment6 pages, 3 figures

References in corpus (56)

• Advanced Virgo: a 2nd generation interferometric gravitational wave detector
• GWTC-1: A Gravitational-Wave Transient Catalog of Compact Binary Mergers Observed by LIGO and Virgo during the First and Second Observing Runs
• GW190814: Gravitational Waves from the Coalescence of a 23 M${}_{\odot }$ Black Hole with a 2.6 M${}_{\odot }$ Compact Object
• GW190425: Observation of a Compact Binary Coalescence with Total Mass $\sim 3.4M_{\odot }$
• The M-sigma and M-L Relations in Galactic Bulges and Determinations of their Intrinsic Scatter
• Masses, Radii, and Equation of State of Neutron Stars
• Characterization of the LIGO detectors during their sixth science run
• AGN Black Hole Masses and Bolometric Luminosities
• Constraining the Maximum Mass of Neutron Stars From Multi-Messenger Observations of GW170817
• Rapid and Bright Stellar-mass Binary Black Hole Mergers in Active Galactic Nuclei
• Gravitational waves from scattering of stellar-mass black holes in galactic nuclei
• Assisted Inspirals of Stellar Mass Black Holes Embedded in AGN Disks: Solving the "Final AU Problem"
• A torque formula for non-isothermal Type I planetary migration - I. Unsaturated horseshoe drag
• Formation and Evolution of Compact Object Binaries in AGN Disks
• On the Mass Distribution and Birth Masses of Neutron Stars
• The Population of Viscosity- and Gravitational Wave-Driven Supermassive Black Hole Binaries Among Luminous AGN
• On stellar-mass black hole mergers in AGN disks detectable with LIGO
• Hierarchical Black Hole Mergers in Active Galactic Nuclei
• Migration Traps in Disks Around Supermassive Black Holes
• The effect of mass-segregation on gravitational wave sources near massive black holes
• Super-Eddington Accretion Disks around Supermassive black Holes
• Supermassive black holes with high accretion rates in active galactic nuclei: I. First results from a new reverberation mapping campaign
• The final spin from binary black holes in quasi-circular orbits
• Radial migration of gap-opening planets in protoplanetary disks. I. The case of a single planet
• Strong mass segregation around a massive black hole
• How Empty are Disk Gaps Opened by Giant Planets?
• A Cluster of Black Holes at the Galactic Center
• Mass Estimates of a Giant Planet in a Protoplanetary Disk from the Gap Structures
• Active Galactic Nuclei in the Sloan Digital Sky Survey: II. Emission-Line Luminosity Function
• The Migration of Gap-Opening Planets is not Locked to Viscous Disk Evolution
• AGN Disks Harden the Mass Distribution of Stellar-mass Binary Black Hole Mergers
• Ram-pressure stripping of a kicked Hill sphere: Prompt electromagnetic emission from the merger of stellar mass black holes in an AGN accretion disk
• Eccentric Black Hole Gravitational-Wave Capture Sources in Galactic Nuclei: Distribution of Binary Parameters
• On the Rate of Neutron Star Binary Mergers from Globular Clusters
• On the mass radiated by coalescing black-hole binaries
• Exploring the Lower Mass Gap and Unequal Mass Regime in Compact Binary Evolution
• Super-Eddington accretion rates in Narrow Line Seyfert 1 galaxies
• Binaries migrating in a gaseous disk: Where are the Galactic center binaries?
• Spin Evolution of Stellar-mass Black Hole Binaries in Active Galactic Nuclei
• Quasiuniversal properties of neutron star mergers
• Black hole genealogy: Identifying hierarchical mergers with gravitational waves
• Pulsing ULXs: tip of the iceberg?
• Gravitational-wave luminosity of binary neutron stars mergers
• Merging Black Holes in the Low-mass and High-mass Gaps from 2+2 Quadruple Systems
• Black holes in the low mass gap: Implications for gravitational wave observations
• Black-hole remnants from black-hole--neutron-star mergers
• Super-Eddington Black-Hole Models for SS 433
• 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
• GW170817A as a Hierarchical Black Hole Merger
• Was GW190412 born from a hierarchical 3+1 quadruple configuration?
• Cosmic Evolution of Stellar-mass Black Hole Merger Rate in Active Galactic Nuclei
• Formation of mass gap objects in highly asymmetric mergers
• G2 can Illuminate the Black Hole Population near the Galactic Center
• Being Careful with the Field Formation Interpretation of GW190412
• The growth of stellar mass black hole binaries trapped in an accretion disk of active galactic nuclei

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• Hierarchical mergers of stellar-mass black holes and their gravitational-wave signatures
• Observation of Gravitational Waves from the Coalescence of a $2.5\text{-}4.5M_{\odot }$ Compact Object and a Neutron Star
• New binary black hole mergers in the LIGO--Virgo O3a data
• Impact of Massive Binary Star and Cosmic Evolution on Gravitational Wave Observations I: Black Hole-Neutron Star Mergers
• Stellar Evolution in AGN Disks
• Was GW190814 a black hole -- strange quark star system?
• Do LIGO/Virgo black hole mergers produce AGN flares? The case of GW190521 and prospects for reaching a confident association
• Binary Black Hole Merger Rates in AGN Disks versus Nuclear Star Clusters: Loud beats Quiet
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• Accretion-modified Stars in Accretion Disks of Active Galactic Nuclei: Gravitational Wave Bursts and Electromagnetic Counterparts from Merging Stellar Black Hole Binaries
• Constraints on the maximum mass of neutron stars with a quark core from GW170817 and NICER PSR J0030+0451 data
• Outflow Bubbles from Compact Binary Mergers Embedded in Active Galactic Nuclei: Cavity Formation and the Impact on Electromagnetic Counterparts
• Accretion-modified Stars in Accretion Disks of Active Galactic Nuclei: Slowly Transient Appearance
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• Observable signature of merging stellar-mass black holes in active galactic nuclei
• QCD color superconductivity in compact stars: color-flavor locked quark star candidate for the gravitational-wave signal GW190814
• Supercritical accretion of stellar-mass compact objects in active galactic nuclei
• Resolving The Peak Of The Black Hole Mass Spectrum
• Can stellar-mass black hole growth disrupt disks of active galactic nuclei? The role of mechanical feedback
• Quiescent and active galactic nuclei as factories of merging compact objects in the era of gravitational-wave astronomy
• Compact Binary Coalescences: Astrophysical Processes and Lessons Learned
• Accretion-Induced Collapse of Neutron Stars in the Disks of Active Galactic Nuclei
• Binary black hole spectroscopy: a no-hair test of GW190814 and GW190412
• Feedback-Dominated Accretion Flows
• Thermonuclear Explosions and Accretion-induced Collapses of White Dwarfs in Active Galactic Nucleus Accretion Disks
• First and second-generation black hole and neutron star mergers in 2+2 quadruples: population statistics
• Final compact remnants in core-collapse supernovae from 20 to 40 $M_{\odot }$: the lower mass gap
• Mass-gap extreme mass ratio inspirals
• Micro Tidal Disruption Events in Active Galactic Nuclei
• Observable signatures of stellar-mass black holes in active galactic nuclei
• GeV Signatures of Short Gamma-Ray Bursts in Active Galactic Nuclei
• The emergence of diffused Gamma-Ray Burst afterglows from the disks of Active Galactic Nuclei
• Impact of natal kicks on merger rates and spin-orbit misalignments of black hole -- neutron star mergers
• Implications of the Conformal Constraint on Sound Speed on the Radius of PSR J0952-0607 within Rastall Gravity
• GRB 191019A: a short gamma-ray burst in disguise from the disk of an active galactic nucleus
• Dynamical formation of the GW190814 merger
• Nuclear Matter and Neutron Stars from Relativistic Brueckner-Hartree-Fock Theory
• Prompt Emission of Gamma-Ray Bursts in the High-density Environment of Active Galactic Nuclei Accretion Disks
• Time-dependent stellar-mass binary black hole mergers in AGN disks: Mass distribution of hierarchical mergers
• On the Neutron Star/Black Hole Mass Gap and Black Hole Searches
• Gravitational wave source populations: Disentangling an AGN component
• Explodability fluctuations of massive stellar cores enable asymmetric compact object mergers such as GW190814
• Mapping the Outcomes of Stellar Evolution in the Disks of Active Galactic Nuclei
• Multi-Messenger Constraints on Magnetic Fields in Merging Black Hole-Neutron Star Binaries
• Possible binary neutron star merger history of the primary of GW230529
• Detection of LIGO-Virgo binary black holes in the pair-instability mass gap
• Constraining Quadratic $f(R)$ Gravity from Astrophysical Observations of the Pulsar J0704+6620
• Orbital Eccentricity and Spin-Orbit Misalignment Are Evidence that Neutron Star-Black Hole Mergers Form through Triple Star Evolution
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• Determining the Hubble Constant with AGN-assisted Black Hole Mergers
• Swift X-ray Follow-Up Observations of Gravitational Wave and High-Energy Neutrino Coincident Signals
• The origin channels of hierarchical binary black hole mergers in the LIGO-Virgo-KAGRA O1, O2, and O3 runs
• Unexpected LIGO events and the Mirror World
• Astrophysics with the Laser Interferometer Space Antenna
• A Common Origin for Low Mass Ratio Events Observed by LIGO and Virgo in the First Half of the Third Observing Run
• Not all roads lead to merger: AGN disc properties influence the interactions of highly unequal mass black holes
• Mass Distribution and "Mass Gap" of Compact Stellar Remnants in Binary Systems
• Numerical Relativity Estimates of the Remnant Recoil Velocity in Binary Neutron Star Mergers
• Spin-up and spin distribution of stellar black holes grown by gas accretion in proto-stellar clusters
• Signatures of Hierarchical Mergers in Black Hole Spin and Mass distribution
• Massive Neutron Stars and White Dwarfs as Noncommutative Fuzzy Spheres