The Population of Viscosity- and Gravitational Wave-Driven Supermassive Black Hole Binaries Among Luminous AGN

Abstract

Supermassive black hole binaries (SMBHBs) in galactic nuclei are thought to be a common by-product of major galaxy mergers. We use simple disk models for the circumbinary gas and for the binary-disk interaction to follow the orbital decay of SMBHBs with a range of total masses (M) and mass ratios (q), through physically distinct regions of the disk, until gravitational waves (GWs) take over their evolution. Prior to the GW-driven phase, the viscous decay is in the stalled "secondary-dominated" regime. SMBHBs spend a non-negligible fraction of 10^7 years at orbital periods t_var between a day and a year. A dedicated optical or X-ray survey could identify coalescing SMBHBs statistically, as a population of periodically variable quasars, whose abundance N_var is proportional to t_var^alpha, in a range of periods t_var around tens of weeks. SMBHBs with M < 10^7 M_sun, with 0.5 < alpha < 1.5, would probe the physics of viscous orbital decay, whereas the detection of a population of higher-mass binaries, with alpha=8/3, would confirm that their decay is driven by GWs. The lowest mass SMBHBs (M < 10^{5-6} M_sun) enter the GW-driven regime at short orbital periods, in the frequency band of the Laser Interferometric Space Antenna (LISA). While viscous processes are strongly sub-dominant in the last few years of coalescence, they could reduce the amplitude of any unresolved background of near-stationary LISA sources. We discuss constraints on the SMBHB population available from existing data, and the sensitivity and sky coverage requirements for a detection in future surveys. SMBHBs may also be identified from velocity shifts in their spectra; we discuss the expected abundance of SMBHBs as a function of their orbital velocity.

submitted to ApJ; supersedes arXiv:0807.4697, with significant new material added

References in corpus (22)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
• An Observational Determination of the Bolometric Quasar Luminosity Function
• A Compact Supermassive Binary Black Hole System
• Massive black hole binary mergers within sub-pc scale gas discs
• A Candidate Sub-Parsec Supermassive Binary Black Hole System
• Observable Signatures of a Black Hole Ejected by Gravitational Radiation Recoil in a Galaxy Merger
• Anatomy of the binary black hole recoil: A multipolar analysis
• Prompt Shocks in the Gas Disk Around a Recoiling Supermassive Black Hole Binary
• Pre-Merger Localization of Gravitational-Wave Standard Sirens With LISA: Triggered Search for an Electromagnetic Counterpart
• A supermassive binary black hole with triple disks
• On the search of electromagnetic cosmological counterparts to coalescences of massive black hole binaries
• Supermassive binary black holes among cosmic gamma-ray sources
• A Possible Periodicity in the Radio Lightcurves of 3C454.3
• The DEEP Groth Strip Survey VI. Spectroscopic, Variability, and X-ray Detection of AGN
• The Subaru/XMM-Newton Deep Survey (SXDS) - V. Optically Faint Variable Object Survey
• Linking optical and infrared observations with gravitational wave sources through variability
• Gravitational wave detection using high precision pulsar observations
• The Subaru/XMM-Newton Deep Survey (SXDS) - VI. Properties of Active Galactic Nuclei Selected by Optical Variability
• LISA sources and science
• Optical Monitoring of 3C 390.3 from 1995 to 2004 and Possible Periodicities in the Historical Light Curve
• Formation of Nuclear Disks and Supermassive Black Hole Binaries in Multi-Scale Hydrodynamical Galaxy Mergers
• Massive black hole binaries in gaseous nuclear discs

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• Measuring the parameters of massive black hole binary systems with Pulsar Timing Array observations of gravitational waves
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• A Periodically Varying Luminous Quasar at z=2 from the Pan-STARRS1 Medium Deep Survey: A Candidate Supermassive Black Hole Binary in the Gravitational Wave-Driven Regime
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• The Bardeen-Petterson effect in accreting supermassive black-hole binaries: disc breaking and critical obliquity
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• Host Galaxy Demographics Of Individually Detectable Supermassive Black-hole Binaries with Pulsar Timing Arrays
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• A catalogue of candidate milli-parsec separation massive black hole binaries from long term optical photometric monitoring
• Very Large Array imaging rules out precessing radio jets in three DES$-$SDSS-selected candidate periodic quasars
• Prospects for Time-Domain and Multi-Messenger Science with eXTP
• Astrophysics with the Laser Interferometer Space Antenna
• Black Hole Merger Rates in AGN: contribution from gas-captured binaries
• Accretion mediated spin-eccentricity correlations in LISA massive black hole binaries
• Unravelling the formation of the first supermassive black holes with the SKA pulsar timing array
• Tracking on-the-fly massive black hole binary evolution and coalescence in galaxy simulations: RAMCOAL
• The Active Galactic Nuclei in the Hobby-Eberly Telescope Dark Energy Experiment Survey (HETDEX) III. A red quasar with extremely high equivalent widths showing powerful outflows
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• On Variation of Light Curves and Broad Emission Lines for Periodic QSOs from co-rotating Supermassive binary black holes in elliptical orbits
• The Host Galaxies of PTA Sources: Converting Supermassive BH Binary Parameters into EM Observables
• Meet the parents: the progenitor binary for the supermassive black hole candidate in E1821+643
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