Reaching the Peak of the Quasar Spectral Energy Distribution I: Observations and Models

Abstract

We perform a spectral analysis of a sample of 11 medium redshift (1.5 < z < 2.2) quasars. Our sample all have optical spectra from the SDSS, infrared spectra from GNIRS and TSPEC, and X-ray spectra from XMM-Newton. We first analyse the Balmer broad emission line profiles which are shifted into the IR spectra to constrain black hole masses. Then we fit an energy-conserving, three component accretion model of the broadband spectral energy distribution (SED) to our multi-wavelength data. Five out of the 11 quasars show evidence of an SED peak, allowing us to constrain their bolometric luminosity from these models and estimate their mass accretion rates. Based on our limited sample, we suggest that estimating bolometric luminosities from L_5100A and L_2-10keV may be unreliable, as has been also noted for a low-redshift, X-ray selected AGN sample.

arXiv comment22 pages, 11 figures, 7 tables; accepted for publication in MNRAS

References in corpus (51)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
• Composite Quasar Spectra From the Sloan Digital Sky Survey
• Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation-Mapping Database
• The Relation between Black Hole Mass, Bulge Mass, and Near-Infrared Luminosity
• The VizieR database of Astronomical Catalogues
• A Catalog of Quasar Properties from SDSS DR7
• Determining Central Black Hole Masses in Distant Active Galaxies and Quasars. II. Improved Optical and UV Scaling Relationships
• A Cosmology Calculator for the World Wide Web
• A Method of Correcting Near-Infrared Spectra for Telluric Absorption
• The Sloan Digital Sky Survey Quasar Catalog V. Seventh Data Release
• Spectral Energy Distributions of Hard X-ray selected AGNs in the XMDS Survey
• Estimating Black Hole Masses in Active Galaxies Using the Halpha Emission Line
• AGN Black Hole Masses and Bolometric Luminosities
• Intrinsic disc emission and the Soft X-ray Excess in AGN
• The cosmological evolution of quasar black-hole masses
• A Composite HST Spectrum of Quasars
• Piecing Together the X-ray Background: Bolometric Corrections for Active Galactic Nuclei
• An Explanation for the soft X-ray excess in AGN
• The Lick AGN Monitoring Project: Broad-Line Region Radii and Black Hole Masses from Reverberation Mapping of Hbeta
• The X-ray to optical-UV luminosity ratio of X-ray selected Type 1 AGN in XMM-COSMOS
• Reverberation Mapping Measurements of Black Hole Masses in Six Local Seyfert Galaxies
• The Radiative Efficiency of Accretion Flows in Individual AGN
• The unusual emission line spectrum of IZw1
• A rapidly spinning supermassive black hole at the centre of NGC 1365
• The case for AGN feedback in galaxy groups
• Comparing Single-Epoch Virial Black Hole Mass Estimators for Luminous Quasars
• The ultraluminous state revisited: fractional variability and spectral shape as diagnostics of super-Eddington accretion
• A fast and long-lived outflow from the supermassive black hole in NGC 5548
• Black Hole Growth to z = 2 - I: Improved Virial Methods for Measuring M_BH and L/L_Edd
• A Combined Optical and X-ray Study of Unobscured Type 1 AGN. I. Optical Spectra and SED Modeling
• A combined Optical and X-ray Spectra Study for Type 1 AGN. III. Broadband SED Properties
• Black-Hole Mass and Growth Rate at High Redshift
• Rapid N_H changes in NGC 4151
• Active galactic nuclei at z ~ 1.5: I. Spectral energy distribution and accretion discs
• NuSTAR and XMM-Newton Observations of NGC 1365: Extreme Absorption Variability and a Constant Inner Accretion Disk
• X-ray reverberation in 1H0707-495 revisited
• The soft X-ray emission of Ark 120. XMM-Newton, NuSTAR, and the importance of taking the broad view
• Spectral Energy Distributions of Type 1 AGN in the COSMOS Survey I - The XMM-COSMOS Sample
• Understanding Reverberation Lags in 1H0707-495
• The Effects of Disc Winds on the Spectrum and Black Hole Growth Rate of Active Galactic Nuclei
• A Combined Optical and X-ray Study of Unobscured Type 1 AGN. II. Relation Between X-ray Emission and Optical Spectra
• Chandra and XMM-Newton observations of the first quasars: X-rays from the age of cosmic enlightenment
• A new way to measure supermassive black hole spin in accretion disc dominated Active Galaxies
• CIV Line-Width Anomalies: The Perils of Low S/N Spectra
• A Long XMM-Newton Observation of An Extreme Narrow Line Seyfert 1: PG 1244+026
• X-ray time delays in the Narrow Line Seyfert 1 galaxy PG 1244+026
• A Physical Model for the X-ray Time Lags of Narrow Line Seyfert Type 1 Active Galactic Nuclei
• A comparative analysis of virial black-hole mass estimates of moderate-luminosity active galactic nuclei using Subaru/FMOS
• A compact, metal-rich, kpc-scale outflow in FBQS J0209-0438: Detailed diagnostics from HST/COS extreme UV observations
• The hard X-ray spectrum of NGC 1365: scattered light, not black hole spin

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• Super- and sub-Eddington accreting massive black holes: A comparison of slim and thin accretion discs through study of the spectral energy distribution
• An FMOS Survey of moderate-luminosity broad-line AGN in COSMOS, SXDS and E-CDF-S
• Reaching the Peak of the quasar spectral energy distribution - II. Exploring the accretion disc, dusty torus and host galaxy
• PSFGAN: a generative adversarial network system for separating quasar point sources and host galaxy light
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• The Extreme Super-Eddington NLS1 RX J0134.2-4258 -- II. A Weak-Line Seyfert Linking to the Weak-Line Quasar
• Black hole masses of weak emission line quasars based on continuum fit method
• Bulk Comptonization by Turbulence in Accretion Disks
• The SOUX AGN Sample: SDSS-XMM-Newton Optical, Ultraviolet and X-ray selected active galactic nuclei spanning a wide range of parameter space -- Sample definition
• Searching for Super-Eddington Quasars using a Photon Trapping Accretion Disc Model
• Disentangling the AGN and Star-Formation Contributions to the Radio-X-ray Emission of Radio-Loud Quasars at 1<z<2
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