The BAT AGN Spectroscopic Survey -- XVIII. Searching for Supermassive Black Hole Binaries in the X-rays

Abstract

Theory predicts that a supermassive black hole binary (SMBHB) could be observed as a luminous active galactic nucleus (AGN) that periodically varies on the order of its orbital timescale. In X-rays, periodic variations could be caused by mechanisms including relativistic Doppler boosting and shocks. Here we present the first systematic search for periodic AGNs using $941$ hard X-ray light curves (14-195 keV) from the first 105 months of the Swift Burst Alert Telescope (BAT) survey (2004-2013). We do not find evidence for periodic AGNs in Swift-BAT, including the previously reported SMBHB candidate MCG+11$-$11$-$032. We find that the null detection is consistent with the combination of the upper-limit binary population in AGNs in our adopted model, their expected periodic variability amplitudes, and the BAT survey characteristics. We have also investigated the detectability of SMBHBs against normal AGN X-ray variability in the context of the eROSITA survey. Under our assumptions of a binary population and the periodic signals they produce which have long periods of hundreds of days, up to $13$% true periodic binaries can be robustly distinguished from normal variable AGNs with the ideal uniform sampling. However, we demonstrate that realistic eROSITA sampling is likely to be insensitive to long-period binaries because longer observing gaps reduce their detectability. In contrast, large observing gaps do not diminish the prospect of detecting binaries of short, few-day periods, as 19% can be successfully recovered, the vast majority of which can be identified by the first half of the survey.

arXiv comment17 pages, including 8 figures and 4 tables. Accepted for publication in ApJ

References in corpus (64)

• LSST: from Science Drivers to Reference Design and Anticipated Data Products
• Energy input from quasars regulates the growth and activity of black holes and their host galaxies
• The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
• A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies: I. Galaxy Mergers & Quasar Activity
• The Burst Alert Telescope (BAT) on the Swift MIDEX Mission
• On characterising the variability properties of X-ray light curves from active galaxies
• Relations Between Central Black Hole Mass and Total Galaxy Stellar Mass in the Local Universe
• Active Galactic Nuclei as scaled-up Galactic black holes
• The 70 Month Swift-BAT All-Sky Hard X-Ray Survey
• BAT AGN Spectroscopic Survey - V. X-ray properties of the Swift/BAT 70-month AGN catalog
• A Compact Supermassive Binary Black Hole System
• X-ray Spectral Variability and Rapid Variability of the Soft X-ray Spectrum Seyfert 1 Galaxies Ark 564 and Ton S180
• The 105 month Swift-BAT all-sky hard X-ray survey
• An Eccentric Circumbinary Accretion Disk and the Detection of Binary Massive Black Holes
• A simple test for periodic signals in red noise
• Binary Black Hole Accretion From a Circumbinary Disk: Gas Dynamics Inside the Central Cavity
• A possible close supermassive black-hole binary in a quasar with optical periodicity
• BAT AGN Spectroscopic Survey I: Spectral Measurements, Derived Quantities, and AGN Demographics
• The Population of Viscosity- and Gravitational Wave-Driven Supermassive Black Hole Binaries Among Luminous AGN
• Compton-thick Accretion in the local Universe
• A systematic search for close supermassive black hole binaries in the Catalina Real-Time Transient Survey
• Swift BAT Survey of AGN
• False periodicities in quasar time-domain surveys
• Three Dimensional MHD Simulation of Circumbinary Accretion Disks: Disk Structures and Angular Momentum Transport
• Accretion into the Central Cavity of a Circumbinary Disk
• A Population of Short-Period Variable Quasars from PTF as Supermassive Black Hole Binary Candidates
• The 22-Month Swift-BAT All-Sky Hard X-ray Survey
• Understanding Dual AGN Activation in the Nearby Universe
• The 4th IBIS/ISGRI soft gamma-ray survey catalog
• X-ray variability of 104 active galactic nuclei. XMM-Newton power-spectrum density profiles
• A 400 solar mass black hole in the Ultraluminous X-ray source M82 X-1 accreting close to its Eddington limit
• Growing supermassive black holes in the late stages of galaxy mergers are heavily obscured
• Circumbinary MHD Accretion into Inspiraling Binary Black Holes
• Relativistic boost as the cause of periodicity in a massive black-hole binary candidate
• The Swift/BAT High Latitude Survey: First Results
• The late inspiral of supermassive black hole binaries with circumbinary gas discs in the LISA band
• Observational Signatures of Binary Supermassive Black Holes
• Accretion disks around binary black holes of unequal mass: GRMHD simulations near decoupling
• A population of luminous accreting black holes with hidden mergers
• A New Population of Compton-Thick AGN Identified Using the Spectral Curvature Above 10 keV
• Characteristic Signatures in the Thermal Emission from Accreting Binary Black Holes
• Long-term variability of AGN at hard X-rays
• Supermassive Black Hole Binary Candidates from the Pan-STARRS1 Medium Deep Survey
• 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
• Galaxy Clusters in the Swift/BAT era: Hard X-rays in the ICM
• Quasi-Periodic Behavior of Mini-Disks in Binary Black Holes Approaching Merger
• INTEGRAL/IBIS 7-year All-Sky Hard X-Ray Survey. Part II: Catalog of Sources
• Massive BH Binaries as Periodically-Variable AGN
• Buried AGNs in Advanced Mergers:Mid-infrared color selection as a dual AGN finder
• The electromagnetic chirp of a compact binary black hole: a phase template for the gravitational wave inspiral
• Quasi-Periodicity of Supermassive Binary Black Hole Accretion Approaching Merger
• Active Galactic Nuclei and their Large-scale Structure: an eROSITA mock catalogue
• A Systematic Search for Periodically Varying Quasars in Pan-STARRS1: An Extended Baseline Test in Medium Deep Survey Field MD09
• Did ASAS-SN Kill the Supermassive Black Hole Binary Candidate PG1302-102?
• Repeated Imaging of Massive Black Hole Binary Orbits with Millimeter Interferometry: measuring black hole masses and the Hubble constant
• Hard X-ray Variability of AGN
• Population Estimates for Electromagnetically-Distinguishable Supermassive Binary Black Holes
• Galaxy Clusters in the Swift/BAT era II: 10 more Clusters detected above 15 keV
• Swift data hint at a binary Super Massive Black Hole candidate at sub-parsec separation
• The Lack of Diffuse, Nonthermal Hard X-ray Emission in the Coma Cluster: The Swift BAT's Eye View
• Hard X-ray spectral variability of the brightest Seyfert AGN in the Swift/BAT sample
• 4MOST Consortium Survey 6: Active Galactic Nuclei
• How bright are the gaps in circumbinary disk systems?
• The First Hard X-Ray Power Spectral Density Functions of AGN

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