Testing the disk-corona interplay in radiatively-efficient broad-line AGN

Abstract

The correlation observed between monochromatic X-ray and UV luminosities in radiatively-efficient active galactic nuclei (AGN) lacks a clear theoretical explanation despite being used for many applications. Such a correlation, with its small intrinsic scatter and its slope that is smaller than unity in log space, represents the compelling evidence that a mechanism regulating the energetic interaction between the accretion disk and the X-ray corona must be in place. This ensures that going from fainter to brighter sources the coronal emission increases less than the disk emission. We discuss here a self-consistently coupled disk-corona model that can identify this regulating mechanism in terms of modified viscosity prescriptions in the accretion disk. The model predicts a lower fraction of accretion power dissipated in the corona for higher accretion states. We then present a quantitative observational test of the model using a reference sample of broad-line AGN and modeling the disk-corona emission for each source in the $L_X-L_{UV}$ plane. We used the slope, normalization, and scatter of the observed relation to constrain the parameters of the theoretical model. For non-spinning black holes and static coronae, we find that the accretion prescriptions that match the observed slope of the $L_X-L_{UV}$ relation produce X-rays that are too weak with respect to the normalization of the observed relation. Instead, considering moderately-outflowing Comptonizing coronae and/or a more realistic high-spinning black hole population significantly relax the tension between the strength of the observed and modeled X-ray emission, while also predicting very low intrinsic scatter in the $L_X-L_{UV}$ relation. In particular, this latter scenario traces a known selection effect of flux-limited samples that preferentially select high-spinning, hence brighter, sources.

17 pages, 15 figures. Accepted in A&A

References in corpus (37)

• An Observational Determination of the Bolometric Quasar Luminosity Function
• An XMM-Newton survey of broad iron lines in Seyfert galaxies
• Biases in Virial Black Hole Masses: An SDSS Perspective
• The X-ray-to-Optical Properties of Optically-Selected Active Galaxies Over Wide Luminosity and Redshift Ranges
• Piecing Together the X-ray Background: Bolometric Corrections for Active Galactic Nuclei
• X-ray reverberation around accreting black holes
• The Sloan Digital Sky Survey Quasar Catalog: twelfth data release
• Simultaneous X-ray/optical/UV snapshots of active galactic nuclei from XMM-Newton: spectral energy distributions for the reverberation mapped sample
• Space Telescope and Optical Reverberation Mapping Project. II. Swift and HST Reverberation Mapping of the Accretion Disk of NGC 5548
• Sizes and Temperature Profiles of Quasar Accretion Disks from Chromatic Microlensing
• The First Swift Intensive AGN Accretion Disk Reverberation Mapping Survey
• The Sloan Digital Sky Survey Reverberation Mapping Project: Sample Characterization
• Mean Spectral Energy Distributions and Bolometric Corrections for Luminous Quasars
• The characteristic blue spectra of accretion disks in quasars as uncovered in the infrared
• Active galactic nuclei at z ~ 1.5: I. Spectral energy distribution and accretion discs
• The cosmological properties of AGN in the XMM-Newton Hard Bright Survey
• An accretion disc-corona model for X-ray spectra of active galactic nuclei
• Observational Constraints on the Dependence of Radio-Quiet Quasar X-ray Emission on Black Hole Mass and Accretion Rate
• The Soft-Excess in Mrk 509: Warm Corona or Relativistic Reflection?
• Spectral Hardening in Black Hole Accretion: Giving Spectral Modelers an f
• Detection of Time Lags Between Quasar Continuum Emission Bands based on Pan-STARRS Light-curves
• Relativistic resistive magnetohydrodynamic reconnection and plasmoid formation in merging flux tubes
• On the X-ray spectra of luminous, inhomogeneous accretion flows
• High-energy monitoring of NGC 4593 II. Broadband spectral analysis: testing the two-corona model
• The X-ray/UV ratio in Active Galactic Nuclei: dispersion and variability
• Magnetically elevated accretion disks in active galactic nuclei: broad emission line regions and associated star formation
• Test of the Formation mechanism of the Broad Line Region in Active Galactic Nuclei
• On the limit cycle instability in magnetized accretion discs
• Revisiting the structure and spectrum of the magnetic-reconnection-heated corona in luminous AGNs
• Constraints on accretion disk size in the massive type 1 quasar PG 2308+098 from optical continuum reverberation lags
• Hot Corona Properties of Swift/BAT detected AGN
• The non-linear X-ray/UV relation in active galactic nuclei: contribution of instrumental effects on the X-ray variability
• Investigating the Disk-Corona Relation in a Blue AGN Sample
• Spectral Energy Distribution Variations of Nearby Seyfert Galaxies During AGN Watch Monitoring Programs
• Local stability and global instability in iron-opaque disks
• Spectra and Structure of Accretion Disks with Nonzero Inner Torque
• Properties of an accretion disc with a power-law stress-pressure relationship

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