Hot, cold, and multi-component accretion flows around supermassive black hole binaries

Abstract

We develop a model for supermassive black hole binaries (SMBHBs) accreting below their Eddington limit, focusing on systems where hot, advection-dominated flows become viable. We specifically explore the spectral appearance of multi-component accretion flows where the solution can independently transition between cold, thin disks and hot, advection-dominated torii depending on the local accretion rate. Using a three-disk model, we compute spectral energy distributions for four possible accretion configurations and assess their observational signatures, including which frequencies might reflect variability at the binary orbital period. The spectral modeling reveals that binary accretion can self-consistently account for many of the properties of standard AGN, while the variability analysis shows that hydrodynamic modulation at the binary period is most likely in the thermal emission and low-frequency synchrotron components. Doppler boosting of emitting material bound to a single binary component would also induce periodic variability. We apply our model to the SMBHB candidate PG1302-102 and demonstrate that a mixed-component accretion state (plus a jet feature) can self-consistently capture the observed broadband spectrum. Our model offers a framework for interpreting candidate SMBHBs and motivates future multi-wavelength follow-up of potential multi-messenger sources, as well as more detailed future modeling of multi-component binary accretion.

19 pages and 9 figures

References in corpus (101)

• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• TianQin: a space-borne gravitational wave detector
• First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
• The NANOGrav 15-year Data Set: Evidence for a Gravitational-Wave Background
• Efficient Generation of Jets from Magnetically Arrested Accretion on a Rapidly Spinning Black Hole
• Search for an isotropic gravitational-wave background with the Parkes Pulsar Timing Array
• Searching for the nano-Hertz stochastic gravitational wave background with the Chinese Pulsar Timing Array Data Release I
• The second data release from the European Pulsar Timing Array III. Search for gravitational wave signals
• Magnetically Arrested Disk: An Energetically Efficient Accretion Flow
• First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon
• Blazars in the Fermi Era: The OVRO 40-m Telescope Monitoring Program
• The stochastic gravitational-wave background from massive black hole binary systems: implications for observations with Pulsar Timing Arrays
• An Eccentric Circumbinary Accretion Disk and the Detection of Binary Massive Black Holes
• The NANOGrav 15-year Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational Wave Background
• Binary Black Hole Accretion From a Circumbinary Disk: Gas Dynamics Inside the Central Cavity
• Internal shocks in the jets of radio-loud quasars
• A possible close supermassive black-hole binary in a quasar with optical periodicity
• The International Pulsar Timing Array second data release: Search for an isotropic Gravitational Wave Background
• General relativistic magnetohydrodynamical simulations of the jet in M87
• Tracing Black Hole Mergers Through Radio Lobe Morphology
• Accretion into the Central Cavity of a Circumbinary Disk
• A Population of Short-Period Variable Quasars from PTF as Supermassive Black Hole Binary Candidates
• Hydrodynamics of circumbinary accretion: Angular momentum transfer and binary orbital evolution
• Viscous Hydrodynamics Simulations of Circumbinary Accretion Discs: Variability, Quasi-Steady State, and Angular Momentum Transfer
• Relativistic boost as the cause of periodicity in a massive black-hole binary candidate
• The Radiative Efficiency of Hot Accretion Flows
• An Accretion-Jet Model for Black Hole Binaries: Interpreting the Spectral and Timing Features of XTE J1118+480
• Galactic Centre stellar winds and Sgr A* accretion
• A prescription for the turbulent heating of astrophysical plasmas
• Hybrid Thermal-Nonthermal Synchrotron Emission from Hot Accretion Flows
• Spectral Models for Low-luminosity Active Galactic Nuclei in LINERs: The Role of Advection-dominated Accretion and Jets
• Thermal disequilibration of ions and electrons by collisionless plasma turbulence
• Gas-driven inspiral of binaries in thin accretion disks
• Identifying Supermassive Black Hole Binaries with Broad Emission Line Diagnosis
• Radiative, two-temperature simulations of low luminosity black hole accretion flows in general relativity
• Observational Signatures of Binary Supermassive Black Holes
• Orbital Evolution of Equal-mass Eccentric Binaries due to a Gas Disk: Eccentric Inspirals and Circular Outspirals
• Electron and proton heating in trans-relativistic magnetic reconnection
• Radiatively Inefficient Accretion Flow in the Nucleus of NGC 1097
• A transition in circumbinary accretion discs at a binary mass ratio of 1:25
• Characteristic Signatures in the Thermal Emission from Accreting Binary Black Holes
• Binary Black Hole Mergers in Gaseous Environments: "Binary Bondi" and "Binary Bondi-Hoyle-Lyttleton" Accretion
• Three Dimensional MHD Simulation of Circumbinary Accretion Disks -2. Net Accretion Rate
• Equilibrium eccentricity of accreting binaries
• Formation of Magnetically Truncated Accretion Disks in 3D Radiation-Transport Two-Temperature GRMHD Simulations
• Periodic self-lensing from accreting massive black hole binaries
• The MeerKAT Pulsar Timing Array: The first search for gravitational waves with the MeerKAT radio telescope
• Orbital Evolution of Binaries in Circumbinary Disks
• A Large Systematic Search for Close Supermassive Binary and Rapidly Recoiling Black Holes - III. Radial Velocity Variations
• The evolution of large cavities and disc eccentricity in circumbinary discs
• Massive BH Binaries as Periodically-Variable AGN
• Relativistic Mergers of Supermassive Black Holes and their Electromagnetic Signatures
• Precession and accretion in circumbinary discs: The case of HD 104237
• Circumbinary discs: Numerical and physical behaviour
• The Unanticipated Phenomenology of the Blazar PKS~2131$-$021: A Unique Super-Massive Black Hole Binary Candidate
• Mergers of Supermassive Black Holes in Astrophysical Environments
• Minidisks in Binary Black Hole Accretion
• Toward determining the number of observable supermassive black hole shadows
• Identifying Decaying Supermassive Black Hole Binaries from their Variable Electromagnetic Emission
• A Survey of Disc Thickness and Viscosity in Circumbinary Accretion: Binary Evolution, Variability, and Disc Morphology
• Did ASAS-SN Kill the Supermassive Black Hole Binary Candidate PG1302-102?
• Observable Consequences of Merger-Driven Gaps and Holes in Black Hole Accretion Disks
• A reduced orbital period for the supermassive black hole binary candidate in the quasar PG 1302-102?
• A Large Systematic Search for Close Supermassive Binary and Rapidly Recoiling Black Holes - II. Continued Spectroscopic Monitoring and Optical Flux Variability
• New Analytical Formula for Supercritical Accretion Flows
• Testing the relativistic Doppler boost hypothesis for supermassive black hole binary candidates
• Ripple effects & oscillations in the broad FeKa line as a probe of massive black hole mergers
• Ultra-Short-Period Massive Black Hole Binary Candidates in LSST as LISA "Verification Binaries"
• Long-Lived Eccentric Modes in Circumbinary Disks
• Binary accretion rates: dependence on temperature and mass-ratio
• Systematic two-dimensional radiation hydrodynamic simulations of super-Eddington accretion flow and outflow: Comparison with the slim disk model
• A Radial Velocity Test for Supermassive Black Hole Binaries as an Explanation for Broad, Double-Peaked Emission Lines in Active Galactic Nuclei
• Repeated Imaging of Massive Black Hole Binary Orbits with Millimeter Interferometry: measuring black hole masses and the Hubble constant
• Precession-induced Variability in AGN Jets and OJ 287
• Gravitational Self-Lensing in Populations of Massive Black Hole Binaries
• Toward the unambiguous identification of supermassive binary black holes through Bayesian inference
• Possible Origin of Radio Emission from Nonthermal Electrons in Hot Accretion Flows for Low-Luminosity Active Galactic Nuclei
• Constraining the parameters of the putative supermassive binary black hole in PG 1302-102 from its radio structure
• The evolution of the mass ratio of accreting binaries: the role of gas temperature
• Emission Signatures from Sub-parsec Binary Supermassive Black Holes II: Effect of Accretion Disk Wind on Broad Emission Lines
• How Binaries Accrete: Hydrodynamic Simulations with Passive Tracer Particles
• Lighthouse in the Dust: Infrared Echoes of Periodic Emission from Massive Black Hole Binaries
• A unified accretion disc model for supermassive black holes in galaxy formation simulations: method and implementation
• Dissecting the Stochastic Gravitational Wave Background with Astrometry
• Testing the relativistic Doppler boost hypothesis for the binary candidate quasar PG1302-102 with multi-band Swift data
• Emission Signatures from Sub-parsec Binary Supermassive Black Holes III: Comparison of Models with Observations
• Considerations for the Observability of Kinematically Offset Binary AGN
• Spectral Energy Distributions of Candidate Periodically-Variable Quasars: Testing the Binary Black Hole Hypothesis
• Variation of Broad Emission Lines from QSOs with Optical/UV Periodicity to Test the Interpretation of Supermassive Binary Black Holes
• Survey of Radiative, Two-Temperature Magnetically Arrested Simulations of the Black Hole M87* I: Turbulent Electron Heating
• Magnetically Arrested Circumbinary Accretion Flows
• Unveiling the hosts of parsec-scale massive black hole binaries: morphology and electromagnetic signatures
• Suppressed accretion onto massive black hole binaries surrounded by thin disks
• On the behaviour of eccentric sub-pc massive black hole binaries embedded in massive discs
• Radiation Magnetohydrodynamic Simulation of sub-Eddington Circumbinary Disk around an Equal-mass Massive Black Hole Binary
• Lyman edges in supermassive black hole binaries
• Host Galaxy Demographics Of Individually Detectable Supermassive Black-hole Binaries with Pulsar Timing Arrays
• Testing compact massive black hole binary candidates through multi-epoch spectroscopy
• X-Ray Reflection Signatures of Supermassive Black Hole Binaries
• The Host Galaxies of PTA Sources: Converting Supermassive BH Binary Parameters into EM Observables
• Analytical and Numerical Analysis of Circumbinary Disk Dynamics -- I: Coplanar Systems

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