Reliable Identification of Binary Supermassive Black Holes from Rubin Observatory Time-Domain Monitoring

Abstract

Periodic signatures in time-domain observations of quasars have been used to search for binary supermassive black holes. These searches, across existing time-domain surveys, have produced several hundred candidates. The general stochastic variability of quasars, however, can masquerade as a false-positive periodic signal, especially when monitoring cadence and duration are limited. In this work, we predict the detectability of binary supermassive black holes in the upcoming Rubin Observatory Legacy Survey of Space and Time (LSST). We apply computationally inexpensive sinusoidal curve fits to millions of simulated LSST Deep Drilling Field light curves of both single, isolated quasars and binary quasars. Period and phase of simulated binary signals can generally be disentangled from quasar variability. Binary amplitude is overestimated and poorly recovered for two-thirds of potential binaries due to quasar accretion variability. Quasars with strong intrinsic variability can obscure a binary signal too much for recovery. We also find that the most luminous quasars mimic current binary candidate light curves and their properties: false positive rates are 60\% for these quasars. The reliable recovery of binary period and phase for a wide range of input binary LSST light curves is promising for multi-messenger characterization of binary supermassive black holes. However, pure electromagnetic detections of binaries using photometric periodicity with amplitude greater than 0.1 magnitude will result in samples that are overwhelmed by false positives. This paper represents an important and computationally inexpensive way forward for understanding the true and false positive rates for binary candidates identified by Rubin.

arXiv comment21 pages, 14 figures, 3 tables

References in corpus (74)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• The NumPy array: a structure for efficient numerical computation
• Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies
• LSST: from Science Drivers to Reference Design and Anticipated Data Products
• The NANOGrav 15-year Data Set: Evidence for a Gravitational-Wave Background
• A Catalog of Quasar Properties from SDSS DR7
• First Results from the Catalina Real-time Transient Survey
• Understanding the Lomb-Scargle Periodogram
• Search for an isotropic gravitational-wave background with the Parkes Pulsar Timing Array
• An Observational Determination of the Bolometric Quasar Luminosity Function
• Are the Variations in Quasar Optical Flux Driven by Thermal Fluctuations?
• Modeling the Time Variability of SDSS Stripe 82 Quasars as a Damped Random Walk
• The Ensemble Photometric Variability of ~25000 Quasars in the Sloan Digital Sky Survey
• Measuring the rotation period distribution of field M-dwarfs with Kepler
• A Compact Supermassive Binary Black Hole System
• Black Hole Masses and Eddington Ratios at 0.3<z<4
• Mass Functions of the Active Black Holes in Distant Quasars from the Large Bright Quasar Survey, the Bright Quasar Survey, and the Color-Selected Sample of the SDSS Fall Equatorial Stripe
• 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
• Quantifying Quasar Variability As Part of a General Approach To Classifying Continuously Varying Sources
• Is Quasar Optical Variability a Damped Random Walk?
• The second data release from the European Pulsar Timing Array I. The dataset and timing analysis
• A systematic search for close supermassive black hole binaries in the Catalina Real-Time Transient Survey
• A Description of Quasar Variability Measured Using Repeated SDSS and POSS Imaging
• False periodicities in quasar time-domain surveys
• Accretion into the Central Cavity of a Circumbinary Disk
• Long-term optical variability properties of the Palomar-Green quasars
• Flexible and Scalable Methods for Quantifying Stochastic Variability in the Era of Massive Time-Domain Astronomical Data Sets
• The Quest for Dual and Binary Supermassive Black Holes: A Multi-Messenger View
• A Population of Short-Period Variable Quasars from PTF as Supermassive Black Hole Binary Candidates
• Kepler Observations of Rapid Optical Variability in Active Galactic Nuclei
• Evolution of the AGN UV luminosity function from redshift 7.5
• Viscous Hydrodynamics Simulations of Circumbinary Accretion Discs: Variability, Quasi-Steady State, and Angular Momentum Transfer
• A Catalog of Quasar Properties from Sloan Digital Sky Survey Data Release 16
• Relativistic boost as the cause of periodicity in a massive black-hole binary candidate
• Observability of Dual Active Galactic Nuclei in Merging Galaxies
• Constraints on Black Hole Growth, Quasar Lifetimes, and Eddington Ratio Distributions from the SDSS Broad Line Quasar Black Hole Mass Function
• The Local Nanohertz Gravitational-Wave Landscape From Supermassive Black Hole Binaries
• Structure Function Analysis of Long Term Quasar Variability
• Optimization of the Observing Cadence for the Rubin Observatory Legacy Survey of Space and Time: a pioneering process of community-focused experimental design
• On the variability of quasars: a link between Eddington ratio and optical variability?
• An all-sky search for continuous gravitational waves in the Parkes Pulsar Timing Array data set
• The late inspiral of supermassive black hole binaries with circumbinary gas discs in the LISA band
• Variability in active galactic nuclei: confrontation of models with observations
• Quasar Optical Variability in the Palomar-QUEST Survey
• Electromagnetic Counterparts to Massive Black Hole Mergers
• Limitations on the recovery of the true AGN variability parameters using Damped Random Walk modeling
• Supermassive Black Hole Binary Candidates from the Pan-STARRS1 Medium Deep Survey
• Machine Learning-based Brokers for Real-time Classification of the LSST Alert Stream
• Constraining the Orbit of Supermassive Black Hole Binary 0402+379
• Improving Damped Random Walk parameters for SDSS Stripe 82 Quasars with Pan-STARRS1
• Go with the Flow: Understanding Inflow Mechanisms in Galaxy Collisions
• Testing the binary hypothesis: pulsar timing constraints on supermassive black hole binary candidates
• Massive BH Binaries as Periodically-Variable AGN
• AGN Variability Analysis Handbook
• The ANTARES Astronomical Time-Domain Event Broker
• Varstrometry for Off-nucleus and Dual sub-Kpc AGN (VODKA): Hubble Space Telescope Discovers Double Quasars
• Examining AGN UV/optical Variability Beyond the Simple Damped Random Walk
• Multi-band light curves from eccentric accreting supermassive black hole binaries
• Candidate Periodically Variable Quasars from the Dark Energy Survey and the Sloan Digital Sky Survey
• Testing the relativistic Doppler boost hypothesis for supermassive black hole binary candidates
• Multi-messenger Time-domain Signatures Of Supermassive Black Hole Binaries
• Ultra-Short-Period Massive Black Hole Binary Candidates in LSST as LISA "Verification Binaries"
• UGC 4211: A Confirmed Dual Active Galactic Nucleus in the Local Universe at 230 pc Nuclear Separation
• The Origin of Double-peaked Narrow Lines in Active Galactic Nuclei. IV. Association with Galaxy Mergers
• Gravitational Self-Lensing in Populations of Massive Black Hole Binaries
• Toward the unambiguous identification of supermassive binary black holes through Bayesian inference
• Quasars with Periodic Variability: Capabilities and Limitations of Bayesian Searches for Supermassive Black Hole Binaries in Time-Domain Surveys
• Multi-messenger Approaches to Supermassive Black Hole Binary Detection and Parameter Estimation: Implications for Nanohertz Gravitational Wave Searches with Pulsar Timing Arrays
• A Method to Measure the Unbiased Decorrelation Timescale of the AGN Variable Signal from Structure Functions
• Eccentric Minidisks in Accreting Binaries
• ANTARES: Progress towards building a `Broker' of time-domain alerts
• No Evidence for Periodic Variability in the Light Curve of Active Galaxy J0045+41

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• Time Evolution of Mg II in SDSS J2320+0024: Implications for a Subparsec Binary Supermassive Black Hole System
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• Search for Quasar Pairs with $Gaia$ Astrometric Data. I. Method and Candidates
• Primordial Black Holes from Spatially Varying Cosmological Constant Induced by Field Fluctuations in Extra Dimensions
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