A global view of the inner accretion and ejection flow around super massive black holes: radiation driven accretion disk winds in a physical context

Abstract

Understanding the physics and geometry of accretion and ejection around super massive black holes (SMBHs) is important to understand the evolution of active galactic nuclei (AGN) and therefore of the large scale structures of the Universe. We aim at providing a simple, coherent, and global view of the sub-parsec accretion and ejection flow in AGN with varying Eddington ratio, $\dot{m}$, and black hole mass, $M_{BH}$. We made use of theoretical insights, results of numerical simulations, as well as UV and X-ray observations to review the inner regions of AGN by including different accretion and ejection modes, with special emphasis on the role of radiation in driving powerful accretion disk winds from the inner regions around the central SMBH. We propose five $\dot{m}$ regimes where the physics of the inner accretion and ejection flow around SMBHs is expected to change, and that correspond observationally to quiescent and inactive galaxies; low luminosity AGN (LLAGN); Seyferts and mini-broad absorption line quasars (mini-BAL QSOs); narrow line Seyfert 1 galaxies (NLS1s) and broad absorption line quasars (BAL QSOs); and super-Eddington sources. We include in this scenario radiation-driven disk winds, which are strong in the high $\dot{m}$, large $M_{BH}$ regime, and possibly present but likely weak in the moderate $\dot{m}$, small $M_{BH}$ regime. A great diversity of the accretion/ejection flows in AGN can be explained to a good degree by varying just two fundamental properties: the Eddington ratio $\dot{m}$ and the black hole mass $M_{BH}$, and by the inclusion of accretion disk winds that can naturally be launched by the radiation emitted from luminous accretion disks.

arXiv commentMatches the published version after language editing; some references added

References in corpus (172)

• Observational Evidence of AGN Feedback
• Advection-Dominated Accretion: A Self-Similar Solution
• A Unified, Merger-Driven Model for the Origin of Starbursts, Quasars, the Cosmic X-Ray Background, Supermassive Black Holes and Galaxy Spheroids
• Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation-Mapping Database
• Advection-Dominated Accretion: Underfed Black Holes and Neutron Stars
• Measuring Distance and Properties of the Milky Way's Central Supermassive Black Hole with Stellar Orbits
• Hot Accretion Flows Around Black Holes
• A Catalog of Quasar Properties from SDSS DR7
• On the Fate of Gas Accreting at a Low Rate onto a Black Hole
• Advection-Dominated Accretion and the Spectral States of Black Hole X-Ray Binaries: Application to Nova Muscae 1991
• Determining Central Black Hole Masses in Distant Active Galaxies and Quasars. II. Improved Optical and UV Scaling Relationships
• Modelling the behaviour of accretion flows in X-ray binaries
• The Co-Evolution of Galaxies and Supermassive Black Holes: Insights from Surveys of the Contemporary Universe
• Nuclear Activity in Nearby Galaxies
• Dynamics of line-driven disk winds in Active Galactic Nuclei
• Revisiting the Unified Model of Active Galactic Nuclei
• A Structure for Quasars
• A Scheme to Unify Low-Power Accreting Black Holes - Jet-Dominated Accretion Flows and the Radio/X-Ray Correlation
• Evidence for ultra-fast outflows in radio-quiet AGNs: I - detection and statistical incidence of Fe K-shell absorption lines
• Dynamics of Line-Driven Disk Winds in Active Galactic Nuclei II: Effects of Disk Radiation
• Black Hole Mass and Eddington Ratio as Drivers for the Observable Properties of Radio-Loud and Radio-Quiet QSOs
• The AGN Obscuring Torus -- End of the "Doughnut" Paradigm?
• The Lick AGN Monitoring Project: Broad-Line Region Radii and Black Hole Masses from Reverberation Mapping of Hbeta
• A Global Three Dimensional Radiation Magneto-hydrodynamic Simulation of Super-Eddington Accretion Disks
• The Spectral Energy Distributions of Low-Luminosity Active Galactic Nuclei
• Unification of Luminous Type 1 Quasars through CIV Emission
• Probing the Coevolution of Supermassive Black Holes and Galaxies Using Gravitationally Lensed Quasar Hosts
• Bolometric luminosities and Eddington ratios of X-ray selected Active Galactic Nuclei in the XMM-COSMOS survey
• A Catalog of Broad Absorption Line Quasars from the Sloan Digital Sky Survey Third Data Release
• A Catalog of Broad Absorption Line Quasars in Sloan Digital Sky Survey Data Release 5
• The diversity of quasars unified by accretion and orientation
• Unusual Broad Absorption Line Quasars from the Sloan Digital Sky Survey
• Simultaneous X-ray/optical/UV snapshots of active galactic nuclei from XMM-Newton: spectral energy distributions for the reverberation mapped sample
• Numerical simulations of super-critical black hole accretion flows in general relativity
• The close environments of accreting massive black holes are shaped by radiative feedback
• XMM-Newton Reflection Grating Spectrometer Observations of Discrete Soft-X-ray Emission Features from NGC 1068
• The Radiative Efficiency of Accretion Flows in Individual AGN
• Eigenvector 1: An Optimal Correlation Space for Active Galactic Nuclei
• Three-Dimensional General Relativistic Radiation Magnetohydrodynamical Simulation of Super-Eddington Accretion, using a new code HARMRAD with M1 Closure
• Radiative Models of Sgr A* from GRMHD Simulations
• On the Nature of Soft X-ray Weak Quasi-Stellar Objects
• Space Telescope and Optical Reverberation Mapping Project. III. Optical Continuum Emission and Broad-Band Time Delays in NGC 5548
• Scaling Laws for Advection Dominated Flows: Applications to Low Luminosity Galactic Nuclei
• Modeling reverberation mapping data II: dynamical modeling of the Lick AGN Monitoring Project 2008 dataset
• A rapidly spinning supermassive black hole at the centre of NGC 1365
• The Black Hole Mass, Stellar M/L, and Dark Halo in M87
• Extreme X-ray spectral variability in the Seyfert 2 Galaxy NGC 1365
• Chandra Detects Relativistic Broad Absorption Lines from APM 08279+5255
• On Black Hole Masses and Radio Loudness in AGN
• Black hole feedback in the luminous quasar PDS 456
• The Simultaneous Optical-to-X-ray Spectral Energy Distribution of Soft X-ray Selected AGN observed by Swift
• The Suzaku view of highly-ionised outflows in AGN: I - Statistical detection and global absorber properties
• Numerical Simulation of Hot Accretion Flows (II): Nature, Origin, and Properties of Outflow and Their Possible Observational Applications
• Grand unification of AGN activity in the LambdaCDM cosmology
• VLBI Imaging of Water Maser Emission from the Nuclear Torus of NGC 1068
• A fast and long-lived outflow from the supermassive black hole in NGC 5548
• Super-Eddington Accretion Disks around Supermassive black Holes
• First X-ray-Based Statistical Tests for Clumpy-Torus Models: Eclipse Events from 230 Years of Monitoring of Seyfert AGN
• The Sizes of the X-ray and Optical Emission Regions of RXJ1131-1231
• The New Generation Atlas of Quasar Spectral Energy Distributions from Radio to X-rays
• Broad Emission Line Regions in AGN: the Link with the Accretion Power
• Three-dimensional simulations of super-critical black hole accretion disks --- luminosities, photon trapping and variability
• Electron Heating in Hot Accretion Flows
• On the Disappearance of the Broad-Line Region in Low-Luminosity Agns
• XMM-NEWTON Reveals the Quasar Outflow in PG 1115+080
• Evidence for ultra-fast outflows in radio-quiet AGNs: III - location and energetics
• The Intrinsic Fraction of Broad Absorption Line Quasars
• The dividing line between FR I and FR II radio--galaxies
• Searching for the Physical Drivers of the Eigenvector 1 Correlation Space
• On the Fraction of Quasars with Outflows
• X-ray Microlensing in RXJ1131-1231 and HE1104-1805
• The UV Properties of the Narrow Line Quasar I Zwicky 1
• X-ray Insights into the Nature of PHL 1811 Analogs and Weak Emission-Line Quasars: Unification with a Geometrically Thick Accretion Disk?
• The effect of radiation pressure on dusty absorbing gas around AGN
• Warm absorbers in X-rays (WAX), a comprehensive high resolution grating spectral study of a sample of Seyfert galaxies: I. A global view and frequency of occurrence of warm absorbers
• Ultra-fast outflows in radio-loud active galactic nuclei
• Spectral Models for Low-luminosity Active Galactic Nuclei in LINERs: The Role of Advection-dominated Accretion and Jets
• X-ray absorption by Broad Line Region Clouds in Mrk 766
• A combined Optical and X-ray Spectra Study for Type 1 AGN. III. Broadband SED Properties
• The central parsecs of M87: jet emission and an elusive accretion disc
• Discovery of ultra-fast outflows in a sample of Broad Line Radio Galaxies observed with Suzaku
• NuSTAR Spectroscopy of Multi-Component X-ray Reflection from NGC 1068
• "Comets" orbiting a black hole
• Observational appearance of inefficient accretion flows and jets in 3D GRMHD simulations: Application to Sgr~A*
• On the role of the UV and X-ray radiation in driving a disk wind in X-ray binaries
• Warm absorbers in active galactic nuclei
• The power output of local obscured and unobscured AGN: crossing the absorption barrier with Swift/BAT and IRAS
• Multi-dimensional modelling of X-ray spectra for AGN accretion-disk outflows III: application to a hydrodynamical simulation
• 2MASS Reveals a Large Intrinsic Fraction of BALQSOs
• NuSTAR catches the unveiling nucleus of NGC 1068
• Radiative, two-temperature simulations of low luminosity black hole accretion flows in general relativity
• High-Resolution X-ray and Ultraviolet Spectroscopy of the Complex Intrinsic Absorption in NGC 4051 with Chandra and HST
• Coupled jet-disk model for Sgr A*: explaining the flat-spectrum radio core with GRMHD simulations of jets
• Radiative pressure feedback by a quasar in a galactic bulge
• A Physical Model of FeLoBALs: Implications for Quasar Feedback
• Host dynamics and origin of Palomar-Green QSOs
• Multi-dimensional modelling of X-ray spectra for AGN accretion-disk outflows
• The Link Between the Hidden Broad Line Region and the Accretion Rate in Seyfert 2 Galaxies
• Tombaugh 2: The First Open Cluster with a Significant Abundance Spread or Embedded in a Cold Stellar Stream?
• Confirmation of and Variable Energy Injection by a Near-Relativistic Outflow in APM 08279+5255
• Magnetically-Driven Accretion-Disk Winds and Ultra-Fast Outflows in PG1211+143
• Exploring NLS1 through the physical properties of their hosts
• Chasing obscuration in type-I AGN: discovery of an eclipsing clumpy wind at the outer broad-line region of NGC 3783
• The high-Eddington NLS1 Ark 564 has the coolest corona
• Evidence for a radiatively driven disc-wind in PDS 456?
• Heavy X-ray Absorption in Soft X-ray Weak Active Galactic Nuclei
• A non-hydrodynamical model for acceleration of line-driven winds in Active Galactic Nuclei
• The soft X-ray emission of Ark 120. XMM-Newton, NuSTAR, and the importance of taking the broad view
• Evidence that 50% of BALQSO Outflows Are Situated at Least 100 pc from the Central Source
• Weak Hard X-ray Emission from Broad Absorption Line Quasars: Evidence for Intrinsic X-ray Weakness
• The rise of an ionized wind in the Narrow Line Seyfert 1 Galaxy Mrk 335 observed by XMM-Newton and HST
• Stratified Magnetically-Driven Accretion-Disk Winds and Their Relations to Jets
• The impact of accretion disk winds on the X-ray spectrum of AGN: Part 2 - XSCORT + Hydrodynamic Simulations
• X-ray evidence for a mildly relativistic and variable outflow in the luminous Seyfert 1 galaxy Mrk509
• Failed radiatively Accelerated Dusty Outflow model of the Broad Line Region in Active Galactic Nuclei. I. Analytical solution
• Weak Hard X-ray Emission from Two Broad Absorption Line Quasars Observed with NuSTAR: Compton-thick Absorption or Intrinsic X-ray Weakness?
• An XMM-Newton observation of Ark 120: the X-ray spectrum of a `bare' Seyfert 1 nucleus
• The Radiative Efficiency and Spectra of Slowly Accreting Black Holes from Two-Temperature GRRMHD Simulations
• Relativistic blue- and red-shifted absorption lines in AGNs
• Testing Quasar Unification: Radiative Transfer in Clumpy Winds
• Radio Through X-ray Spectral Energy Distributions of 38 Broad Absorption Line Quasars
• Does the X-ray outflow quasar PDS 456 have a UV outflow at 0.3c?
• Short term X-ray spectral variability of the quasar PDS 456 observed in a low flux state
• On how much X-ray and UV radiation processes are coupled in accretion disks: AGN case
• Variable X-ray absorption in the mini-BAL QSO PG 1126-041
• Kinetic and radiative power from optically thin accretion flows
• A Consistent Picture Emerges: A Compact X-ray Continuum Emission Region in the Gravitationally Lensed Quasar SDSS J0924+0219
• The NuSTAR view of reflection and absorption in NGC 7582
• X-Ray Insights Into the Physics of Mini-BAL Quasar Outflows
• Super-Eddington QSO RX J0439.6-5311. I. Origin of the Soft X-ray Excess and Structure of the Inner Accretion Flow
• Super-Eddington QSO RX J0439.6-5311. II. Multi-wavelength Constraints on the Global Structure of the Accretion Flow
• XMM-Newton and Chandra Spectroscopy of the Variable High-Energy Absorption of PG 1115+080: Refined Outflow Constraints
• The Seyfert AGN RX J0136.9-3510 and the Spectral State of Super Eddington Accretion Flows
• An axisymmetric, hydrodynamical model for the torus wind in AGN
• A study of the X-rayed outflow of APM 08279+5255 through photoionization codes
• A deep X-ray view of the bare AGN Ark120. V. Spin determination from disc-Comptonisation efficiency method
• The Transition from "Normal" to "Broad Absorption Line Quasar" of Ton 34
• Photoionization calculations of the radiation force due to spectral lines in AGNs
• An Occultation Event in Centaurus A and the Clumpy Torus Model
• Discovery of a fast, broad, transient outflow in NGC 985
• HS 1700+6416: the first high redshift non lensed NAL-QSO showing variable high velocity outflows
• The mass of the black hole in RE J1034+396
• On the absorption of X-ray bright broad absorption line quasars
• Revealing the location and structure of the accretion disk-wind in PDS456
• The XMM deep survey in the CDF-S. IX. An X-ray outflow in a luminous obscured quasar at z~1.6
• On the diversity and complexity of absorption line profiles produced by outflows in Active Galactic Nuclei
• Probing the accretion disk and central engine structure of NGC4258 with Suzaku and XMM-Newton observations
• The Ultraviolet-X-ray connection in AGN outflows
• The dusty tori of nearby QSOs as constrained by high-resolution mid-IR observations
• High Velocity Outflows in Narrow Absorption Line Quasars
• Discovery of the Transition of a Mini-Broad Absorption Line into Broad Absorption in the SDSS Quasar J115122.14+020426.3
• Narrow absorption lines complex I: one form of broad absorption line
• Suzaku Observations of Near-Relativistic Outflows in the BAL Quasar APM 08279+5255
• A deep X-ray view of the bare AGN Ark 120. I. Revealing the Soft X-ray Line Emission
• The relation of optical/UV and X-ray emission in low-luminosity active galactic nuclei
• Discovery of Newly Formed Broad Absorption Lines in a Radio-Loud Quasar
• HST and Ground-Based Spectroscopy of Quasar Outflows: From Mini-BALs to BALs
• Steep Hard-X-ray Spectra Indicate Extremely High Accretion Rates in Weak Emission-Line Quasars
• The Wide-Angle Outflow of the Lensed z = 1.51 AGN HS 0810+2554
• The X-Ray Properties of the Optically Brightest Mini-BAL Quasars from the Sloan Digital Sky Survey
• Magnified Views of the Ultrafast Outflow of the z = 1.51 AGN HS 0810+2554
• On the Virialization of Disk Winds: Implications for the Black Hole Mass Estimates in AGN
• The variability of the warm absorber in I Zwicky 1 as seen by XMM-Newton
• Yet another UFO in the X-ray spectrum of a high-z lensed QSO
• The rest-frame UV-to-optical spectroscopy of APM 08279+5255 - BAL classification and black hole mass estimates
• An extended XMM-Newton observation of the Seyfert galaxy NGC 4051 - III. FeK emission and absorption
• Revealing a hard X-ray spectral component that reverberates within one light hour of the central supermassive black hole in Ark 564
• Accretion in active galactic nuclei and disk-jet coupling
• No evidence for an Eddington-ratio dependence of X-ray weakness in BALQSOs
• Investigating the radio-loud phase of broad absorption line quasars
• Unveiling the X-ray/UV properties of disk winds in active galactic nuclei using broad and mini-broad absorption line quasars
• The NuSTAR view of the Seyfert Galaxy HE 0436-4717

Cited by in corpus (99)

• Cool Outflows in Galaxies and their Implications
• Ionized outflows from active galactic nuclei as the essential elements of feedback
• ALMA images the many faces of the NGC1068 torus and its surroundings
• BAL and non-BAL quasars: continuum, emission and absorption properties establish a common parent sample
• Modelling type 1 quasar colours in the era of Rubin and Euclid
• Examining AGN UV/optical Variability Beyond the Simple Damped Random Walk
• Searching for Ultra-fast Outflows in AGN using Variability Spectra
• Supermassive Black Hole Winds in X-rays -- SUBWAYS. I. Ultra-fast outflows in QSOs beyond the local Universe
• Stratified disc wind models for the AGN broad-line region: ultraviolet, optical and X-ray properties
• Testing AGN outflow and accretion models with CIV and HeII emission line demographics in z=2 quasars
• Improved Fe II emission line models for AGN using new atomic datasets
• Multiphase AGN winds from X-ray irradiated disk atmospheres
• Contracting and Expanding Binary Black Holes in 3D Low-Mass AGN Disks: The Importance of Separation
• BASS XXXIX: Swift-BAT AGN with changing-look optical spectra
• The WISSH quasars project VI. Fraction and properties of BAL quasars in the hyper-luminosity regime
• Ionized and hot molecular outflows in the inner 500 pc of NGC1275
• The Physical Properties of Low Redshift FeLoBAL Quasars. I. Spectral Synthesis Analysis of the BAL Outflows using $SimBAL$
• Exploring the link between C IV outflow kinematics and sublimation-temperature dust in quasars
• A hard look at local, optically-selected, obscured Seyfert galaxies
• The first broadband X-ray view of the narrow line Seyfert 1 Ton S180
• Active Galactic Nuclei with Ultra-fast Outflows Monitoring Project: The Broad-line Region of Mrk 79 as a Disk Wind
• Discovery of optical outflows and inflows in the black hole candidate GRS 1716-249
• High-ionization emission line ratios from quasar broad line regions: metallicity or density?
• The eROSITA Final Equatorial Depth Survey (eFEDS): Complex absorption and soft excesses in hard X-ray--selected active galactic nuclei
• A unified accretion disc model for supermassive black holes in galaxy formation simulations: method and implementation
• X-ray polarization from accretion disk winds
• Delving into the depths of NGC 3783 with XRISM. I. Kinematic and ionization structure of the highly ionized outflows
• Fe III emission in quasars: evidence for a dense turbulent medium
• Characterizing Quasar CIV Emission-line Measurements from Time-resolved Spectroscopy
• Speed limits for radiation driven SMBH winds
• NuSTAR Observations of Intrinsically X-ray Weak Quasar Candidates: An Obscuration-Only Scenario
• A disc wind model for blueshifts in quasar broad emission lines
• High Eddington quasars as discovery tools: current state and challenges
• High Metal Content of Highly Accreting Quasars: Analysis of an Extended Sample
• Intermittent AGN episodes drive outflows with a large spread of observable loading factors
• Supermassive Black Hole Winds in X-rays -- SUBWAYS. III. A population study on ultra-fast outflows
• Space Telescope and Optical Reverberation Mapping Project. XI. Disk-wind characteristics and contributions to the very broad emission lines of NGC 5548
• AGN STORM 2. III. A NICER view of the variable X-ray obscurer in Mrk 817
• Placing LOFAR-detected quasars in CIV emission space: implications for winds, jets and star formation
• Powerful multiphase outflows in the central region of Cygnus A
• Large-scale dynamics of winds originated from black hole accretion flows: (I) Hydrodynamics
• A New Emulated Monte Carlo Radiative Transfer Disk-Wind Model: X-Ray Accretion Disk-wind Emulator -- XRADE
• The Properties of Low-Redshift FeLoBAL Quasars: III. The Location and Geometry of the Outflows
• The Physical Properties of Low-Redshift FeLoBAL Quasars: II. The Rest-Frame Optical Emission Line Properties
• A Rapid and Large-Amplitude X-ray Dimming Event in a z ~ 2.6 Radio-Quiet Quasar
• Misaligned jets from Sgr A${}^{\ast }$ and the origin of Fermi/eROSITA bubbles
• Connecting Low- and High-Redshift Weak Emission-Line Quasars via HST Spectroscopy of Ly$\alpha$ Emission
• GA-NIFS: A galaxy-wide outflow in a Compton-thick mini-BAL quasar at z = 3.5 probed in emission and absorption
• A Big Red Dot: Scattered light, host galaxy signatures and multi-phase gas flows in a luminous, heavily reddened quasar at cosmic noon
• Supermassive black hole formation via collisions in black hole clusters
• Galactic Winds across the Gas-Rich Merger Sequence: I. Highly Ionized N V and O VI Outflows in the QUEST Quasars
• SIROCCO: A Publicly Available Monte Carlo Ionization and Radiative Transfer Code for Astrophysical Outflows
• Multiple Flares in the Changing-Look AGN NGC 5273
• The SRG/eROSITA All-Sky Survey: X-ray beacons at late cosmic dawn
• A hadronic emission model for black hole-disc impacts in the blazar OJ 287
• Search for intrinsic NALs in BAL/mini-BAL quasar spectra
• No redshift evolution in the rest-frame UV emission line properties of quasars from z=1.5 to z=4.0
• Shedding New Light on Weak Emission-Line Quasars in the C${}_{\mathrm{IV}}$-H$\beta$ Parameter Space
• The eROSITA Final Equatorial-Depth Survey (eFEDS): The first archetypal Quasar in the feedback phase discovered by eROSITA
• [OIII] emission in z=2 quasars with and without Broad Absorption Lines
• Supermassive Black Hole Winds in X-rays: SUBWAYS. II. HST UV spectroscopy of winds at intermediate redshifts
• Statistical analysis of AlIII 1860 and CIII] 1909 emission lines as virial black hole mass estimators in quasars
• The multi-epoch X-ray tale of I Zwicky 1 outflows
• How does the radio enhancement of broad absorption line quasars relate to colour and accretion rate?
• AGN and Star Formation at Cosmic Noon: Comparison of Data to Theoretical Models
• Connection between Emission and Absorption Outflows through the Study of Quasars with Extremely-High Velocity Outflows
• Large-scale Dynamics of Winds Driven by Line Force from a Thin Accretion Disk
• An X-ray fading, UV brightening QSO at $z\approx 6$
• Ultra-high-energy cosmic rays from ultra-fast outflows of active galactic nuclei
• Blazar jets launched with similar energy per baryon, independently of their power
• A broadband X-ray view of the NLSy1 1E 0754.6+392.8
• Examining AGN UV/Optical Variability Beyond the Simple Damped Random Walk. II. Insights from 22 Years Observations of SDSS, PS1 and ZTF
• Properties of a Previously Unidentified Instrumental Signature in $\text{Kepler/K2}$ that was Confused for AGN Variability
• A novel Bayesian approach for decomposing the radio emission of quasars: II. Link between quasar radio emission and black hole mass
• The first X-ray look at SMSS J114447.77-430859.3: the most luminous quasar in the last 9 Gyr
• AGN STORM 2: I. First results: A Change in the Weather of Mrk 817
• Coordinated X-ray and UV absorption within the accretion disk wind of the active galactic nucleus PG 1126-041
• The WISSH quasars project VII. The impact of extreme radiative field in the accretion disk and X-ray corona interplay
• Investigating Non-linear and Stochastic Hard X-ray Variability of Active Galactic Nuclei using Recurrence Analysis
• X-ray selected broad absorption line quasars in SDSS-V: BALs and non-BALs span the same range of X-ray properties
• Numerical simulations of divergence-type theories for conformal dissipative fluids
• Disc wind or disc line? The extraordinary Fe-K feature of Mrk 1513
• Probing the Wind Component of Radio Emission in Luminous High-Redshift Quasars
• Radio Scrutiny of the X-ray-Weak Tail of Low-Mass Active Galactic Nuclei: A Novel Signature of High-Eddington Accretion?
• A Novel Test of Quasar Orientation
• Towards modelling Ghostly DLAs
• X-ray Unveiling Events in a z~1.6 Active Galactic Nucleus in the 7 Ms Chandra Deep Field-South
• A Search for Blazar Activity in Broad-Absorption-Line Quasars
• Exploring the quasar disc-wind-jet connection with LoTSS and SDSS
• The X-ray weakness of Little Red Dots and JWST-selected AGN: comparison with local AGN in different accretion regimes
• Exploratory Study of Transverse Proximity Effect around BAL Quasars
• A Comparison of Properties of Quasars with and without Rapid Broad Absorption Line Variability
• Strong X-ray Variability of I Zwicky 1: Obscuration from Clumpy Accretion-Disk Winds
• Investigating the origin of radio emission in candidate super-Eddington accreting black holes
• A quasar shedding its dust cocoon at redshift 2
• A Hydrodynamical Thermal Irradiated Wind from the Outer Thin Accretion Disk in Low-luminosity Active Galactic Nuclei
• Probing extreme black-hole outflows on short timescales via high spectral-resolution X-ray imagers
• Shape and ionization of equatorial matter near compact objects from X-ray polarization reflection signatures
• Gemini Near Infrared Spectrograph$-$Distant Quasar Survey: the Chandra View