Statistics of Galactic-Scale Quasar Pairs at Cosmic Noon

Abstract

The statistics of galactic-scale quasar pairs can elucidate our understanding of the dynamical evolution of supermassive black hole (SMBH) pairs, the duty cycles of quasar activity in mergers, or even the nature of dark matter, but have been challenging to measure at cosmic noon, the prime epoch of massive galaxy and SMBH formation. Here we measure a double quasar fraction of $\sim 6.2\pm 0.5\times 10^{-4}$ integrated over $\sim 0.3-3$ arcsec separations (projected physical separations of $\sim 3-30\mathrm{kpc}$ at $z\sim 2$) in luminous ($L_{\mathrm{bol}}>10^{45.8}\mathrm{erg}{\mathrm{s}}^{-1}$) unobscured quasars at $1.5<z<3.5$, using Gaia EDR3-resolved pairs around SDSS DR16 quasars. The measurement was based on a sample of 60 Gaia-resolved double quasars (out of 487 Gaia pairs dominated by quasar+star superpositions) at these separations, corrected for pair completeness in Gaia, which we quantify as functions of pair separation, magnitude of the primary, and magnitude contrast. The double quasar fraction increases towards smaller separations by a factor of $\sim 5$ over these scales. The division between physical quasar pairs and lensed quasars in our sample is currently unknown, requiring dedicated follow-up observations (in particular, deep, sub-arcsec-resolution IR imaging for the closest pairs). Intriguingly, at this point the observed pair statistics are in rough agreement with theoretical predictions both for the lensed quasar population in mock catalogs and for dual quasars in cosmological hydrodynamic simulations. Upcoming wide-field imaging/spectroscopic space missions such as Euclid, CSST and Roman, combined with targeted follow-up observations, will conclusively measure the abundances and host galaxy properties of galactic-scale quasar pairs, offset AGNs, and sub-arcsec lensed quasars across cosmic time.

arXiv comment19 pages, 9 figures; submitted to ApJ

References in corpus (78)

• Cosmic Star Formation History
• Cold and Fuzzy Dark Matter
• Ultralight scalars as cosmological dark matter
• A Catalog of Quasar Properties from SDSS DR7
• Wide-Field InfrarRed Survey Telescope-Astrophysics Focused Telescope Assets WFIRST-AFTA 2015 Report
• Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Quasar Sample
• Dancing in the dark: galactic properties trace spin swings along the cosmic web
• The SDSS Quasar Survey: Quasar Luminosity Function from Data Release Three
• Gaia Early Data Release 3: Photometric content and validation
• The NANOGrav 12.5-year Data Set: Search For An Isotropic Stochastic Gravitational-Wave Background
• Discovery of a binary AGN in the ultraluminous infrared galaxy NGC 6240 using Chandra
• Formation of Galactic Nuclei
• The Sloan Digital Sky Survey Quasar Catalog: Sixteenth Data Release
• Cosmological simulations of black hole growth: AGN luminosities and downsizing
• Gravitationally lensed quasars and supernovae in future wide-field optical imaging surveys
• Evolution of massive binary black holes
• Gaia Early Data Release 3 -- Catalogue validation
• Galaxy pairs in the Sloan Digital Sky Survey - IV: Interactions trigger AGN
• The SDSS-III Baryon Oscillation Spectroscopic Survey: Quasar Target Selection for Data Release Nine
• Binary Quasars in the Sloan Digital Sky Survey: Evidence for Excess Clustering on Small Scales
• The Quest for Dual and Binary Supermassive Black Holes: A Multi-Messenger View
• Understanding Dual AGN Activation in the Nearby Universe
• Massive Black Hole Binary Mergers in Dynamical Galactic Environments
• The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Quasar Target Selection
• Observational constraints on the merger history of galaxies since $z\approx 6$: Probabilistic galaxy pair counts in the CANDELS fields
• Supermassive Black Hole Binary Evolution in Axisymmetric Galaxies: the final parsec problem is not a problem
• Where are the most ancient stars in the Milky Way?
• The Sloan Digital Sky Survey Quasar Lens Search. V. Final Catalog from the Seventh Data Release
• Kiloparsec-scale ALMA Imaging of [CII] and Dust Continuum Emission of 27 Quasar Host Galaxies at z~6
• Discovery of Four kpc-Scale Binary AGNs
• Active Galactic Nucleus Pairs from the Sloan Digital Sky Survey. I. The Frequency on ~ 5-100 kpc Scales
• The ASTRID simulation: the evolution of Supermassive Black Holes
• Binary Quasars at High Redshift I: 24 New Quasar Pairs at z ~ 3-4
• Pairing of Supermassive Black Holes in unequal-mass galaxy mergers
• The erratic dynamical life of black hole seeds in high-redshift galaxies
• Origin and properties of dual and offset active galactic nuclei in a cosmological simulation at z=2
• A 1.75 kpc/h Separation Dual AGN at z=0.36 in the COSMOS Field
• Recoiling black holes: prospects for detection and implications of spin alignment
• The ASTRID Simulation: Galaxy Formation and Reionization
• Discovery of an equal-mass "twin" binary population reaching 1000+ AU separations
• A Runaway Black Hole in COSMOS: Gravitational Wave or Slingshot Recoil?
• Growing Massive Black Hole Pairs in Minor Mergers of Disk Galaxies
• Gravitationally Lensed Quasars in Gaia: II. Discovery of 24 Lensed Quasars
• Quasar Clustering at $25\kpch$ from a Complete Sample of Binaries
• Dancing to ChaNGa: A Self-Consistent Prediction For Close SMBH Pair Formation Timescales Following Galaxy Mergers
• A survey of dual active galactic nuclei in simulations of galaxy mergers: frequency and properties
• Gravitationally lensed quasars in Gaia: III. 22 new lensed quasars from Gaia Data Release 2
• Gravitational waves and stalled satellites from massive galaxy mergers at z <= 1
• Rest-frame Optical Properties of Luminous 1.5<z<3.5 Quasars: the Hbeta-[OIII] Region
• Dynamical Friction Modeling of Massive Black Holes in Cosmological Simulations and Effects on Merger Rate Predictions
• Gravitationally lensed quasars in Gaia -- IV. 150 new lenses, quasar pairs, and projected quasars
• Active Galactic Nucleus Pairs from the Sloan Digital Sky Survey. II. Evidence for Tidally Enhanced Star Formation and Black Hole Accretion
• Varstrometry for Off-nucleus and Dual sub-Kpc AGN (VODKA): Methodology and Initial Results with Gaia DR2
• Varstrometry for Off-nucleus and Dual sub-Kpc AGN (VODKA): Hubble Space Telescope Discovers Double Quasars
• Varstrometry for Off-nucleus and Dual sub-Kpc AGN (VODKA): How Well-centered Are Low-z AGN?
• Nuclear coups: dynamics of black holes in galaxy mergers
• Very small-scale clustering of quasars from a complete quasar lens survey
• Unveiling the population of dual- and lensed- AGNs at sub-arcsec separations
• Supermassive black hole pairs in clumpy galaxies at high redshift: delayed binary formation and concurrent mass growth
• Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves
• Dynamical evolution of cosmic supermassive binary black holes and their gravitational wave radiation
• Dual supermassive black holes at close separation revealed by the Hyper Suprime-Cam Subaru Strategic Program
• A hidden population of high-redshift double quasars unveiled by astrometry
• The abundances and properties of Dual AGN and their host galaxies in the EAGLE simulations
• Formation of LISA Black Hole Binaries in Merging Dwarf Galaxies: the Imprint of Dark Matter
• Gravitationally Lensed Quasars in Gaia: I. Resolving Small-Separation Lenses
• Spatially Offset Active Galactic Nuclei I: Selection and Spectroscopic Properties
• Clustering on very small scales from a large sample of confirmed quasar pairs: Does quasar clustering track from Mpc to kpc scales?
• Global torques and stochasticity as the drivers of massive black hole pairing in the young Universe
• A Catalog of 220 Offset and Dual AGNs: Increased AGN Activation in Major Mergers and Separations under 4 kpc
• Discovery of Four Gravitationally Lensed Quasars from the Sloan Digital Sky Survey
• Massive Black Hole Mergers with Orbital Information: Predictions from the ASTRID Simulation
• Wide twin binaries are extremely eccentric: evidence of twin binary formation in circumbinary disks
• SMBH Seeds from Dissipative Dark Matter
• Quasars with Proper Motions and the Link to Double and Multiple AGNs
• A Candidate Kiloparsec-scale Quasar Pair at $z=5.66$
• J1721$+$8842: a gravitationally lensed binary quasar with a proximate damped Lyman-$\alpha$ absorber
• How Similar are the Properties of Quasars with Nearly Identical Ultraviolet Spectra?

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• GA-NIFS: High number of dual active galactic nuclei at z~3
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• A Survey for High-redshift Gravitationally Lensed Quasars and Close Quasars Pairs. I. the Discoveries of an Intermediately-lensed Quasar and a Kpc-scale Quasar Pair at $z\sim 5$
• MUSE adaptive-optics spectroscopy confirms dual active galactic nuclei and strongly lensed systems at sub-arcsec separation
• A Candidate Dual QSO at Cosmic Noon
• Search for Quasar Pairs with $Gaia$ Astrometric Data. I. Method and Candidates
• Spectroscopic confirmation of dual and offset quasars from the Subaru HSC-SSP program