XQR-30: Black Hole Masses and Accretion Rates of 42 z>6 Quasars

Abstract

We present bolometric luminosities, black hole masses and Eddington ratios for 42 luminous quasars at z>6 using high signal-to-noise ratio VLT/X-Shooter spectra, acquired in the enlarged ESO Large Programme XQR-30. In particular, we derive bolometric luminosities from the rest-frame 3000 A, luminosities using a bolometric correction from the literature, and the black hole masses by modelling the spectral regions around the CIV 1549A and the MgII 2798A emission lines, with scaling relations calibrated in the local universe. We find that the black hole masses derived from both emission lines are in the same range, and the scatter of the measurements agrees with expectations from the scaling relations. The MgII-derived masses are between ~(0.8-12) x 10^9 Msun, and the derived Eddington ratios are within ~0.13-1.73, with a mean (median) of 0.84 (0.72). By comparing the total sample of quasars at z>5.8, from this work and from the literature, to a bolometric luminosity distribution-matched sample at z~1.5, we find that quasars at high redshift host slightly less massive black holes which accrete slightly more rapidly than at lower-z, with a difference in the mean Eddington ratios of the two samples of ~0.27, in agreement with recent literature work.

9 pages; 5 figures; accepted for publication in A&A

References in corpus (32)

• Formation of Supermassive Black Holes by Direct Collapse in Pregalactic Halos
• A Luminous Quasar at Redshift 7.642
• Evidence of patchy hydrogen reionization from an extreme Ly$\alpha$ trough below redshift six
• 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
• The Final SDSS High-Redshift Quasar Sample of 52 Quasars at z>5.7
• Physical properties of 15 quasars at $z\gtrsim 6.5$
• Formation of the first nuclear clusters and massive black holes at high redshift
• The origins of massive black holes
• The Radio-Loud Fraction of Quasars is a Strong Function of Redshift and Optical Luminosity
• Black hole masses and enrichment of z ~ 6 SDSS quasars
• Correcting CIV-Based Virial Black Hole Masses
• Initial mass function of intermediate mass black hole seeds
• The Kinematics of z ~ 6 Quasar Host Galaxies
• On the two main classes of Active Galactic Nuclei
• The X-shooter/ALMA Sample of Quasars in the Epoch of Reionization. II. Black Hole Masses, Eddington Ratios, and the Formation of the First Quasars
• XQ-100: A legacy survey of one hundred 3.5 < z < 4.5 quasars observed with VLT/XSHOOTER
• The X-SHOOTER/ALMA sample of Quasars in the Epoch of Reionization. I. NIR spectral modeling, iron enrichment and broad emission line properties
• Three new VHS-DES Quasars at 6.7 < z < 6.9 and Emission Line Properties at z > 6.5
• Detecting and Characterizing Young Quasars I: Systemic Redshifts and Proximity Zones Measurements
• The ALMA view of the high-redshift relation between supermassive black holes and their host galaxies
• The discovery of a highly accreting, radio-loud quasar at z=6.82
• The Sloan Digital Sky Survey Reverberation Mapping Project: MgII Lag Results from Four Years of Monitoring
• XQR-30: the ultimate XSHOOTER quasar sample at the reionization epoch
• A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): A First Look at the Rest-frame Optical Spectra of $z>6.5$ Quasars Using JWST
• Widespread, strong outflows in XQR-30 quasars at the Reionisation epoch
• New Constraints on Quasar Evolution: Broad Line Velocity Shifts over $1.5\lesssim z\lesssim 7.5$
• Discovery of Eight z ~ 6 Quasars in the Sloan Digital Sky Survey Overlap Regions
• EIGER III. JWST/NIRCam observations of the ultra-luminous high-redshift quasar J0100+2802
• Probing the Nature of High Redshift Weak Emission Line Quasars: A Young Quasar with a Starburst Host Galaxy
• Chemical Abundance of z~6 Quasar Broad-Line Regions in the XQR-30 Sample
• Demographics of z ~ 6 Quasars in the Black Hole Mass-Luminosity Plane

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