Systematic Broad-band X-ray Study of super-Eddington Accretion onto Supermassive Black Holes. I. X-ray Continuum

Abstract

We present the first systematic broad-band X-ray study of super-Eddington accretion onto SMBHs with simultaneous {\it NuSTAR} and {\it XMM-Newton} or {\it Swift}/XRT observations of a sample of 8 super-Eddington accreting AGN with Eddington ratio $1<{\lambda }_{\mathrm{Edd}}<426$. We find that the SEAMBHs show a steep primary continuum slope as expected for sources accreting in the super Eddington regime, mostly dominated by relativistic reflection. The Iron K$\alpha$ emission lines of the sources of our sample show relativistic broadening. In addition the equivalent widths of the narrow components of the Iron K$\alpha$ lines follow the 'X-ray Baldwin' effect, also known as the 'Iwasawa-Taniguchi' effect. We found a statistically significant correlation between the photon-index of the primary power-law and the Eddington ratio, consistent with past studies. Moreover, as expected for super-Eddington sources, the median value of the reflection fraction of the sources we analysed is a factor $\sim 2$ higher than the median reflection fraction value of the type\,1 AGN from the BASS sample. We are able to estimate the coronal temperature for three sources of our sample: Mrk\,382 ($k{T}_e=7.8$\,keV), PG\,0026+129 ($k{T}_e=39$\,keV) and IRAS\,04416+1215 ($k{T}_e=3$\,keV). Looking at the position of the SEAMBHs sources of our sample in the compactness-temperature diagram it appears that in super-Eddington AGN, as for lower Eddington ratio AGN, the X-ray corona is controlled by pair production and annihilation.

arXiv commentAccepted for publication in Monthly Notices of the Royal Astronomical Society

References in corpus (88)

• emcee: The MCMC Hammer
• The chemical composition of the Sun
• Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies
• On the Absorption of X-rays in the Interstellar Medium
• The Swift X-ray Telescope
• The European Photon Imaging Camera on XMM-Newton: The MOS Cameras
• The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
• Reverberation Measurements for 17 Quasars and the Size-Mass-Luminosity Relations in Active Galactic Nuclei
• HI4PI: A full-sky HI survey based on EBHIS and GASS
• Nuclear Activity in Nearby Galaxies
• Broad-band gamma-ray and X-ray spectra of NGC 4151 and their implications for physical processes and geometry
• Improved Reflection Models of Black-Hole Accretion Disks: Treating the Angular Distribution of X-rays
• The May 1989 outburst of the Soft X-ray Transient GS 2023+338 (V404 Cyg)
• BAT AGN Spectroscopic Survey - V. X-ray properties of the Swift/BAT 70-month AGN catalog
• X-ray reflected spectra from accretion disk models. III. A complete grid of ionized reflection calculations
• The Lick AGN Monitoring Project: Broad-Line Region Radii and Black Hole Masses from Reverberation Mapping of Hbeta
• Black Hole Winds
• Keplerian Motion of Broad-Line Region Gas as Evidence for Supermassive Black Holes in Active Galactic Nuclei
• The role of the reflection fraction in constraining black hole spin
• A Comprehensive Spectral and Variability Study of Narrow-Line Seyfert 1 Galaxies Observed by ASCA: II. Spectral Analysis and Correlations
• Radio-loud Narrow-Line Type 1 Quasars
• BAT AGN Spectroscopic Survey I: Spectral Measurements, Derived Quantities, and AGN Demographics
• The Radiative Efficiency of Accretion Flows in Individual AGN
• The Formation and Evolution of Massive Black Holes
• Calibration of the NuSTAR High Energy Focusing X-ray Telescope
• The Nature of SS433 and the Ultraluminous X-ray Sources
• The Hard X-ray Spectrum as a Probe for Black-Hole Growth in Radio-Quiet Active Galactic Nuclei
• A spectrophotometric atlas of Narrow-Line Seyfert 1 galaxies
• XMM-Newton EPIC observations of 21 low-redshift PG quasars
• A comparison of the hard ASCA spectral slopes of broad and narrow-line Seyfert 1 galaxies
• CAIXA: a Catalogue of AGN In the XMM-Newton Archive I. Spectral analysis
• Super-Eddington Accretion Disks around Supermassive black Holes
• Supermassive black holes with high accretion rates in active galactic nuclei: I. First results from a new reverberation mapping campaign
• The Hard X-ray Spectral Slope as an Accretion-Rate Indicator in Radio-Quiet Active Galactic Nuclei
• Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. IV. H$\beta$ Time Lags and Implications for Super-Eddington Accretion
• A statistical relation between the X-ray spectral index and Eddington ratio of active galactic nuclei in deep surveys
• X-ray Observations of Optically-Selected, Radio-Quiet Quasars I: The ASCA results
• Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. IX 10 New Observations of Reverberation Mapping and Shortened H$\beta$ Lags
• Testing warm Comptonization models for the origin of the soft X-ray excess in AGN
• ON THE GEOMETRY OF THE X-RAY EMITTING REGION IN SEYFERT GALAXIES
• MCG-6-30-15: Long Timescale X-Ray Variability, Black Hole Mass and AGN High States
• Evidence for a multizone warm absorber in the XMM-Newton spectrum of Markarian 304
• The Cores of the Fe K$\alpha$ Lines in Active Galactic Nuclei: an Extended Chandra High Energy Grating Sample
• On the dependence of the iron K-line profiles with luminosity in Active Galactic Nuclei
• How the X-ray spectrum of a Narrow-Line Seyfert 1 galaxy may be reflection dominated
• BAT AGN Spectroscopic Survey -- XII. The relation between coronal properties of Active Galactic Nuclei and the Eddington ratio
• On the Iwasawa-Taniguchi effect of radio-quiet AGN
• The SDSS/XMM-Newton Quasar Survey: Correlation between X-ray spectral slope and Eddington ratio
• Supermassive black holes with high accretion rates in active galactic nuclei: II. the most luminous standard candles in the Universe
• XMM-Newton discovery of a sharp spectral feature at ~7 keV in the Narrow-Line Seyfert 1 galaxy 1H 0707-495
• The Swift/BAT AGN Spectroscopic Survey (BASS) -- VI. The Gamma_X - L/L_Edd relation
• An X-ray Baldwin effect for the narrow Fe K-alpha lines observed in Active Galactic Nuclei
• Properties of AGN coronae in the NuSTAR era II: hybrid plasma
• A NuSTAR census of coronal parameters in Seyfert galaxies
• Are quasars accreting at super-Eddington rates?
• Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. III. Detection of Fe II Reverberation in Nine Narrow-Line Seyfert 1 Galaxies
• The broad band spectral variability of MCG-6-30-15 observed by NuSTAR and XMM-Newton
• Simultaneous NuSTAR and XMM-Newton 0.5-80 keV spectroscopy of the Narrow Line Seyfert 1 galaxy SWIFT J2127.4+5654
• Iron K$\alpha$ emission in type-I and type-II Active Galactic Nuclei
• Supermassive black holes with high accretion rates in active galactic nuclei. XI. Accretion disk reverberation mapping of Mrk 142
• Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. VIII. Structure of the Broad-Line Region and Mass of the Central Black Hole in Mrk 142
• Bolometric luminosity black-hole growth time and slim accretion discs in active galactic nuclei
• Narrow Line Seyfert 1 galaxies at hard X-rays
• The hard X-ray view of Giga-Hertz Peaked Spectrum Radio Galaxies
• On the X-ray Baldwin effect for narrow Fe Kalpha emission line
• Super-Eddington Accretion in Tidal Disruption Events: the Impact of Realistic Fallback Rates on Accretion Rates
• Studying the relationship between X-ray emission and accretion in AGNs using the XMM-Newton Bright Serendipitous Survey
• Suzaku Observations of Moderately Obscured (Compton-thin) Active Galactic Nuclei Selected by Swift/BAT Hard X-ray Survey
• A New Equilibrium for Accretion Disks Around Black Holes
• The X-ray variability of the Narrow-Line Seyfert 1 galaxy IRAS 13224-3809 from an XMM-Newton observation
• Super- and sub-Eddington accreting massive black holes: A comparison of slim and thin accretion discs through study of the spectral energy distribution
• Swift/XRT observations of unidentified INTEGRAL/IBIS sources
• New Spectral State of Supercritical Accretion Flow with Comptonizing Outflow
• A growth-rate indicator for Compton-thick active galactic nuclei
• Optical, UV, and X-ray Clues to the Nature of Narrow Line AGNs
• Soft X-ray properties of a spectroscopically selected sample of interacting and isolated Seyfert galaxies
• The role of the Gamma-Eddington ratio relation on the X-ray Baldwin effect in Active Galactic Nuclei
• Estimating the size of X-ray lamppost coronae in active galactic nuclei
• BAL QSOs and Extreme UFOs: the Eddington connection
• On Thermal Comptonization in e+- Pair Plasmas
• Suzaku observation of IRAS 00521-7054, a peculiar type-II AGN with a very broad feature at 6 keV
• X-ray perspective of Narrow-line Seyfert 1 galaxies
• UV to X-ray Comptonization delay in Mrk 493
• Variable blurred reflection in the narrow-line Seyfert 1 galaxy Mrk 493
• Multi-Wavelength Properties of Radio-loud Narrow-Line Seyfert 1 Galaxies
• What Determines Unique Spectra of Super-Eddington Accretors?: Origin of Optically Thick and Low Temperature Coronae in Super-Eddington Accretion Flows
• The broad-band spectrum of the Narrow-line Seyfert 1 NGC 4748: from UV to hard X-ray
• Radiative Shocks around Super-Eddington Accreting Black Holes

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