Variability of Active Galactic Nuclei
arXiv:astro-ph/0109495 · doi:10.1142/9789812811318_0002
Abstract
Continuum and emission-line variability of active galactic nuclei provides a powerful probe of microarcsecond scale structures in the central regions of these sources. In this contribution, we review basic concepts and methodologies used in analyzing AGN variability. We develop from first principles the basics of reverberation mapping, and pay special attention to emission-line transfer functions. We discuss application of cross-correlation analysis to AGN light curves. Finally, we provide a short review of recent important results in the field.
63 pages, 41 figures. The larger figures can be retrieved at higher resolution from http://www.astronomy.ohio-state.edu/~peterson/INAOE/
Cited by in corpus (102)
- Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation-Mapping Database
- The Ensemble Photometric Variability of ~25000 Quasars in the Sloan Digital Sky Survey
- Reverberation Measurements of the Inner Radius of the Dust Torus in Nearby Seyfert 1 Galaxies
- The Lick AGN Monitoring Project: Broad-Line Region Radii and Black Hole Masses from Reverberation Mapping of Hbeta
- Black Hole Masses and Eddington Ratios at 0.3<z<4
- Determining Central Black Hole Masses in Distant Active Galaxies
- Reverberation Mapping Measurements of Black Hole Masses in Six Local Seyfert Galaxies
- An Alternative Approach To Measuring Reverberation Lags in Active Galactic Nuclei
- Multiwavelength Monitoring of the Dwarf Seyfert 1 Galaxy NGC 4395. I. A Reverberation-Based Measurement of the Black Hole Mass
- Space Telescope and Optical Reverberation Mapping Project. III. Optical Continuum Emission and Broad-Band Time Delays in NGC 5548
- Raining on black holes and massive galaxies: the top-down multiphase condensation model
- Optical and radio behaviour of the BL Lacertae object 0716+714
- The Lick AGN Monitoring Project 2011: Spectroscopic Campaign and Emission-Line Light Curves
- Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XVI. A Thirteen-Year Study of Spectral Variability in NGC 5548
- PS16dtm: A Tidal Disruption Event in a Narrow-line Seyfert 1 Galaxy
- Diverse Broad Line Region Kinematic Signatures From Reverberation Mapping
- Concerns regarding the use of black hole shadows as standard rulers
- A Revised Broad-Line Region Radius and Black Hole Mass for the Narrow-Line Seyfert 1 NGC 4051
- Long-Term Profile Variability of Double Peaked Emission Lines in Active Galactic Nuclei
- A new activity phase of the blazar 3C 454.3. Multifrequency observations by the WEBT and XMM-Newton in 2007-2008
- The optical microvariability and spectral changes of the BL Lacertae object S5 0716+714
- The largest black holes and the most luminous galaxies
- Theoretical Models of Optical Transients. I. A Broad Exploration of the Duration-Luminosity Phase Space
- The radio delay of the exceptional 3C 454.3 outburst. Follow-up WEBT observations in 2005-2006
- Multiwavelength observations of 3C 454.3. I. The AGILE 2007 November campaign on the "Crazy Diamond"
- Long-Term X-ray Variability of Typical Active Galactic Nuclei in the Distant Universe
- The long-lasting activity of 3C 454.3. GASP-WEBT and satellite observations in 2008-2010
- Towards a Complete Census of AGNs in Nearby Galaxies: The Incidence of Growing Black Holes
- Near-Infrared Reverberation by Dusty Clumpy Tori in Active Galactic Nuclei
- Multiwavelength Monitoring of the Narrow-Line Seyfert 1 Galaxy Akn 564. II. Ultraviolet Continuum and Emission-line Variability
- Rapid Infrared Variability of Three Radio-loud Narrow-line Seyfert 1 Galaxies: A View from the Wide-field Infrared Survey Explorer
- Orientation Effects on the Inner Region of Dusty Torus of Active Galactic Nuclei
- Structure and flux variability in the VLBI jet of BL Lacertae during the WEBT campaigns (1995--2004)
- Variability of the blazar 4C 38.41 (B3 1633+382) from GHz frequencies to GeV energies
- Observational evidence for the link between the variable optical continuum and the subparsec-scale jet of the radio galaxy 3C 390.3
- Quasar Parallax: a Method for Determining Direct Geometrical Distances to Quasars
- Gravitating discs around black holes
- Another look at the BL Lacertae flux and spectral variability
- Variability of Fe II Emission Features in the Seyfert 1 Galaxy NGC 5548
- Spin orientation of supermassive black holes in active galaxies
- Dissecting the long-term emission behaviour of the BL Lac object Mrk 421
- BLR kinematics and Black Hole Mass in Markarian 6
- The Size-Luminosity Relationship of Quasar Narrow-Line Regions
- Reverberation Mapping of Active Galactic Nuclei
- Multiwavelength behaviour of the blazar OJ 248 from radio to γ-rays
- The reverberation lag in the low mass X-ray binary H1743-322
- Hubble Space Telescope Observations of Novae in M49
- OzDES Reverberation Mapping Program: The first Mg II lags from five years of monitoring
- High Redshift Standard Candles: Predicted Cosmological Constraints
- Spitzer Space Telescope Measurements of Dust Reverberation Lags in the Seyfert 1 Galaxy NGC 6418
- Introducing the Search for Intermediate-mass Black-hole In Nearby Galaxy (SIBLING) Survey
- X-ray emission from the blazar AO 0235+16: the XMM-Newton and Chandra point of view
- The rise and fall of the iron-strong nuclear transient PS16dtm
- Is the Broad-Line Region Clumped or Smooth? Constraints from the H alpha Profile in NGC 4395, the Least Luminous Seyfert 1 Galaxy
- Infrared properties of blazars: putting the GASP-WEBT sources into context
- SN2012ab: A Peculiar Type IIn Supernova with Aspherical Circumstellar Material
- SUDARE-VOICE variability-selection of Active Galaxies in the Chandra Deep Field South and the SERVS/SWIRE region
- SDSS J075101.42+291419.1: A Super-Eddington Accreting Quasar with Extreme X-ray Variability
- Gravitational Redshift of Emission Lines in the AGN Spectra
- Modeling the Infrared Reverberation Response of the Circumnuclear Dusty Torus in AGN: The Effects of Cloud Orientation and Anisotropic Illumination
- The optical behaviour of BL Lacertae at its maximum brightness levels: a blend of geometry and energetics
- Optical Variability of Infrared Power Law-Selected Galaxies & X-ray Sources in the GOODS-South Field
- Robotic Reverberation Mapping of the Southern Seyfert NGC 3783
- Gravitational Lenses as High-Resolution Telescopes
- Evidence for hot clumpy accretion flow in the transitional millisecond pulsar PSR J1023+0038
- A study of a sample of high rotation measure AGNs through multifrequency single dish observations
- Redshifts and lens profile for the double quasar QJ 0158-4325
- Placing LOFAR-detected quasars in CIV emission space: implications for winds, jets and star formation
- A decades-long fast-rise-exponential-decay flare in low-luminosity AGN NGC 7213
- Lecture notes on black hole binary astrophysics
- Properties of long-term optical variability of active galactic nuclei with double-peaked broad low-ionization emission lines
- The case for inflow of the broad-line region of active galactic nuclei
- A Multi-wavelength Survey of AGN in Massive Clusters: AGN Detection and Cluster AGN Fraction
- OzDES Reverberation Mapping Program: Lag recovery reliability for 6-year CIV analysis
- Characterization of Optical Light Curves of Extreme Variability Quasars Over a ~16-yr Baseline
- Kinematics of the Broad Line Region in M81
- A Comprehensive Archival Chandra Search for X-ray Emission from Ultracompact Dwarf Galaxies
- Continuum optical-UV and X-ray variability of AGN: current results and future challenges
- The effects of Time-Variable Absorption due to Gamma-Ray Bursts In Active Galactic Nuclei Accretion Disks
- The Metallicity of the Redshift 4.16 Quasar BR2248-1242
- Estimation of the size and structure of the broad line region using Bayesian approach
- Singular Spectrum Analysis of Fermi-LAT Blazar Light Curves: A Systematic Search for Periodicity and Trends in the Time Domain
- More than softer-when-brighter: the X-Ray powerlaw spectral variability in NGC 4051
- The beamed jet and quasar core of the distant blazar 4C 71.07
- Active Galactic Nuclei at the Crossroads of Astrophysics
- Robotic reverberation mapping of the broad-line radio galaxy 3C 120
- Line and Continuum Variability in Active Galaxies
- Toward Precision Measurement of Central Black Hole Masses
- Gamma-ray blazars: the view from AGILE
- Probing black-hole accretion through time variability
- Revealing Dusty Supernovae in High-Redshift (Ultra-)Luminous InfraRed Galaxies Through Near-Infrared Integrated Light Variability
- Gaia-assisted discovery of a detached low-ionisation BAL quasar with very large ejection velocities
- Time Variable Broad Line Emission in NGC 4203: Evidence for Stellar Contrails
- Evidence for microlensing by primordial black holes in quasar broad emission lines
- Time Delay Analysis of the Lensed Quasar SDSS J1001+5027
- An X-ray View of the Ambiguous Nuclear Transient AT2019pev
- A novel approach to study the variability of NGC 5548
- partly obscured accretion disk model to explain Shifted broad Balmer emission lines of Active Galactic Nuclei
- Multiband optical variability on diverse timescales of the blazar Ton 599 from 2011 to 2023
- Amoeba: An AGN Model of Optical Emissions Beyond steady-state Accretion discs
- A Decade of Near-Infrared Variability in NGC4388: Insights into the AGN Structure
- NEXUS: A Search for Nuclear Variability with the First Two JWST NIRCam Epochs