Broad iron lines in Active Galactic Nuclei

Abstract

An intrinsically narrow line emitted by an accretion disk around a black hole appears broadened and skewed as a result of the Doppler effect and gravitational redshift. The fluorescent iron line in the X-ray band at 6.4-6.9keV is the strongest such line and is seen in the X-ray spectrum of many active galactic nuclei and, in particular, Seyfert galaxies. It is an important diagnostic with which to study the geometry and other properties of the accretion flow very close to the central black hole. The broad iron line indicates the presence of a standard thin accretion disk in those objects, often seen at low inclination. The broad iron line has opened up strong gravitational effects around black holes to observational study with wide-reaching consequences for both astrophysics and physics.

26 pages. Invited review, accepted for publication in PASP

References in corpus (4)

• The relativistic iron line profile in the Seyfert 1 Galaxy IC4329a
• Hard X-Ray Spectra of Broad-Line Radio Galaxies from the Rossi X-Ray Timing Explorer
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• Black hole spin estimation of XTE J2012+381 using simultaneous observations of Swift/XRT and NuSTAR
• Spectro-temporal evolution of 4U 1702-429 using AstroSat-NICER
• Constraining black hole spin in PG 1535+547 amidst complex multi-layered absorption
• Probing the Bardeen-Petterson effect in tidal disruption events with spectral line reverberation mapping
• Misalignment of the Lense-Thirring precession by an accretion torque
• Constraining Cubic Curvature Corrections to General Relativity with Quasi-Periodic Oscillations
• Relativistic disc line: a tool to constrain neutron star equation of state models
• The Relation between the Inclinations of Broad Line Regions and the Accretion Disk
• Searching for Black Holes in Space - the key role of X-ray observations
• Iron Line Tomography of General Relativistic Hydrodynamic Accretion around Kerr Black Holes
• Near-Horizon Collisions around Near-Extremal Black Holes
• Boson Cloud Atlas: Direct mass measurements of superradiance clouds near black holes
• Interaction between disk and extended corona in a general relativistic framework
• Accretion Geometry of Black Hole X-ray Binaries: Insights from X-ray Observations
• Modelling the energy dependent X-ray variability of Mrk 335
• Testing the Kerr black hole hypothesis with RELXILL_NK
• Relativistic reflection X-ray spectra of accretion disks
• A broadband X-ray study of a sample of AGNs with [OIII] measured inclinations
• Thermal Comptonization in a changing corona in the changing-look active galaxy NGC 1566
• Selection of Compton-thick AGN from a hard photometric sample using XMM-Newton observations
• Probing properties of nearly two-hundred new active galactic nuclei
• Spectral Analysis of the 2019 and 2022 Outbursts of SAX J1808.4-3658
• An XMM-Newton Analysis of the Supermassive Black Hole Binary Candidate MCG+11--11--032
• Tidal perturbations of an extreme mass ratio inspiral around a Kerr black hole
• Shape and ionization of equatorial matter near compact objects from X-ray polarization reflection signatures
• Accretion-disk reflection in the Seyfert 1 galaxy NGC 3783 as viewed by Chandra grating spectroscopy
• Strong gravity effects: X-ray spectra, variability and polarimetry
• Measuring black hole spin through gravitational lensing of pulsars
• Testing general relativity with X-ray reflection spectroscopy of MCG-06-30-15