Revealing the Accretion Physics of Supermassive Black Holes at Redshift z~7 with Chandra and Infrared Observations

Abstract

X-ray emission from quasars has been detected up to redshift $z=7.5$, although only limited to a few objects at $z>6.5$. In this work, we present new Chandra observations of five $z>6.5$ quasars. By combining with archival Chandra observations of six additional $z>6.5$ quasars, we perform a systematic analysis on the X-ray properties of these earliest accreting supermassive black holes (SMBHs). We measure the black hole masses, bolometric luminosities ($L_{\mathrm{bol}}$), Eddington ratios (${\lambda }_{\mathrm{Edd}}$), emission line properties, and infrared luminosities ($L_{\mathrm{IR}}$) of these quasars using infrared and sub-millimeter observations. Correlation analysis indicates that the X-ray bolometric correction (the factor that converts from X-ray luminosity to bolometric luminosity) decreases with increasing $L_{\mathrm{bol}}$, and that the UV/optical-to-X-ray ratio, ${\alpha }_{\mathrm{ox}}$, strongly correlates with $L_{2500}$, and moderately correlates with ${\lambda }_{\mathrm{Edd}}$ and blueshift of CIV emission lines. These correlations are consistent with those found in lower-$z$ quasars, indicating quasar accretion physics does not evolve with redshift. We also find that $L_{\mathrm{IR}}$ does not correlate with $L_{2-10keV}$ in these luminous distant quasars, suggesting that the ratio of the SMBH growth rate and their host galaxy growth rate in these early luminous quasars are different from those of local galaxies. A joint spectral analysis of the X-ray detected $z>6.5$ quasars yields an average X-ray photon index of $\Gamma =2.32_{-0.30}^{+0.31}$, steeper than that of low-$z$ quasars. By comparing it with the $\Gamma -{\lambda }_{\mathrm{Edd}}$ relation, we conclude that the steepening of $\Gamma$ for quasars at $z>6.5$ is mainly driven by their higher Eddington ratios.

arXiv comment16 pages, 10 figures, Accepted for publication in ApJ

References in corpus (87)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies
• The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
• Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples
• Local Supermassive Black Holes, Relics of Active Galactic Nuclei and the X-ray Background
• A Catalog of Quasar Properties from SDSS DR7
• A luminous quasar at a redshift of z = 7.085
• X-shooter, the new wide band intermediate resolution spectrograph at the ESO Very Large Telescope
• An Observational Determination of the Bolometric Quasar Luminosity Function
• An 800-million-solar-mass black hole in a significantly neutral Universe at redshift 7.5
• A Survey of z>5.8 Quasars in the Sloan Digital Sky Survey I: Discovery of Three New Quasars and the Spatial Density of Luminous Quasars at z~6
• Dynamics of line-driven disk winds in Active Galactic Nuclei
• How small were the first cosmological objects?
• An ultra-luminous quasar with a twelve-billion-solar-mass black hole at redshift 6.30
• The Assembly of the First Massive Black Holes
• A Wavelet-Based Algorithm for the Spatial Analysis of Poisson Data
• An Empirical Ultraviolet Template for Iron Emission in Quasars as Derived from I Zw 1
• The XMM-Newton view of PG quasars I. X-ray continuum and absorption
• Sherpa: a Mission-Independent Data Analysis Application
• Unification of Luminous Type 1 Quasars through CIV Emission
• The X-ray to optical-UV luminosity ratio of X-ray selected Type 1 AGN in XMM-COSMOS
• The X-ray Properties of the Most-Luminous Quasars from the Sloan Digital Sky Survey
• The X-ray Spectral Properties of SCUBA Galaxies
• 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
• The Pan-STARRS1 distant z>5.6 quasar survey: more than 100 quasars within the first Gyr of the universe
• Pōniuā'ena: A Luminous $z=7.5$ Quasar Hosting a 1.5 Billion Solar Mass Black Hole
• 350 Micron Dust Emission from High Redshift Quasars
• Cosmic X-ray Surveys of Distant Active Galaxies: The Demographics, Physics, and Ecology of Growing Supermassive Black Holes
• The Final SDSS High-Redshift Quasar Sample of 52 Quasars at z>5.7
• Bayesian Estimation of Hardness Ratios: Modeling and Computations
• The evolution of massive black hole seeds
• Physical properties of 15 quasars at $z\gtrsim 6.5$
• An ALMA [CII] survey of 27 quasars at z>5.94
• The Mean Star Formation Rate of X-ray selected Active Galaxies and its Evolution from z=2.5: Results from PEP-Herschel
• Discovery of three z>6.5 quasars in the VISTA Kilo-degree Infrared Galaxy (VIKING) survey
• The Hard X-ray Spectrum as a Probe for Black-Hole Growth in Radio-Quiet Active Galactic Nuclei
• XMM-Newton EPIC observations of 21 low-redshift PG quasars
• Can Supermassive Black Holes Form in Metal-Enriched High-Redshift Protogalaxies ?
• Fe II Emission in 14 Low-Redshift Quasars: I - Observations
• The tight relation between X-ray and ultraviolet luminosity of quasars
• Accretion and star formation rates in low redshift type-II active galactic nuclei
• Formation of massive black holes in rapidly growing pre-galactic gas clouds
• A statistical relation between the X-ray spectral index and Eddington ratio of active galactic nuclei in deep surveys
• Black hole mass estimates and emission-line properties of a sample of redshift z>6.5 quasars
• Bright [CII] and dust emission in three z>6.6 quasar host galaxies observed by ALMA
• The case for super-critical accretion onto massive black holes at high redshift
• A Significantly Neutral Intergalactic Medium Around the Luminous z=7 Quasar J0252-0503
• Exploring Reionization-Era Quasars III: Discovery of 16 Quasars at $6.4\lesssim z\lesssim 6.9$ with DESI Legacy Imaging Surveys and UKIRT Hemisphere Survey and Quasar Luminosity Function at $z\sim 6.7$
• Formation of supermassive black hole seeds
• Discovery of the First Low-Luminosity Quasar at z > 7
• The response of relativistic outflowing gas to the inner accretion disk of a black hole
• The Discovery of A Luminous Broad Absorption Line Quasar at A Redshift of 7.02
• Eight new luminous z > 6 quasars selected via SED model fitting of VISTA, WISE and Dark Energy Survey Year 1 Observations
• The Swift/BAT AGN Spectroscopic Survey (BASS) -- VI. The Gamma_X - L/L_Edd relation
• Exploring Reionization-Era Quasars IV: Discovery of Six New $z\gtrsim 6.5$ Quasars with DES, VHS and unWISE Photometry
• Very high redshift quasars and the rapid emergence of super-massive black holes
• Chandra Observations of the Highest Redshift Quasars from the Sloan Digital Sky Survey
• MASE: A New Data--Reduction Pipeline for the Magellan Echellette Spectrograph
• The X-SHOOTER/ALMA sample of Quasars in the Epoch of Reionization. I. NIR spectral modeling, iron enrichment and broad emission line properties
• Dust emission in an accretion-rate-limited sample of z>6 quasars
• The X-ray properties of $z>6$ quasars: no evident evolution of accretion physics in the first Gyr of the Universe
• X-ray Lighthouses of the High-Redshift Universe. II. Further Snapshot Observations of the Most Luminous z>4 Quasars with Chandra
• The X-ray properties of z$\sim$6 luminous quasars
• The WISSH Quasars Project III. X-ray properties of hyper-luminous quasars
• First Discoveries of z>6 Quasars with the DECam Legacy Survey and UKIRT Hemisphere Survey
• Predicting Quasar Continua Near Lyman-$\alpha$ with Principal Component Analysis
• Spatially Resolved Interstellar Medium and Highly-Excited Dense Molecular Gas in the Most Luminous Quasar at z=6.327
• New Constraints on Quasar Evolution: Broad Line Velocity Shifts over $1.5\lesssim z\lesssim 7.5$
• Bright [CII] 158$\mu$m emission in a quasar host galaxy at $z=6.54$
• The correlations between optical/UV broad lines and X-ray emission for a large sample of quasars
• No Redshift Evolution in the Broad Line Region Metallicity up to z=7.54: Deep NIR Spectroscopy of ULAS J1342+0928
• The Contribution of Host Galaxies to the Infrared Energy Output of $z\gtrsim 5.0$ QUASARS
• The Relation between Luminous AGNs and Star Formation in Their Host Galaxies
• Discovery of 16 New z ~ 5.5 Quasars : Filling in the Redshift Gap of Quasar Color Selection
• An XMM-Newton detection of the z=5.80 X-ray weak quasar SDSSp J104433.04-012502.2
• Chandra X-rays from the redshift 7.54 quasar ULAS J1342+0928
• X-rays from the redshift 7.1 quasar ULAS J1120+0641
• The 500 ks Chandra observation of the z = 6.31 QSO SDSS J1030+0524
• Rapid Black Hole Growth at the Dawn of the Universe: A Super-Eddington Quasar at z=6.6
• X-ray Observations of a $z\sim 6.2$ Quasar/Galaxy Merger
• Do high redshift quasars have powerful jets?
• CIV Emission and the Ultraviolet through X-ray Spectral Energy Distribution of Radio-Quiet Quasars
• A Quasar Discovered at redshift 6.6 from Pan-STARRS1
• X-ray properties of z>6.5 quasars
• X-ray observation of ULAS J1120+0641, the most distant quasar at z=7.08
• Exploratory Chandra observation of the ultraluminous quasar SDSS J010013.02+280225.8 at redshift 6.30
• XMM-Newton observation of the ultraluminous quasar SDSS J010013.02+280225.8 at redshift 6.326

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• Can X-ray Observations Improve Optical-UV-based Accretion-Rate Estimates for Quasars?