Spectral variability studies in Active Galactic Nuclei: Exploring continuum and emission line regions in the age of LSST and JWST

Abstract

The investigation of emission line regions within active galaxies (AGNs) has a rich and extensive history, now extending to the use of AGNs and quasars as "standardizable" cosmological indicators, shedding light on the evolution of our universe. As we enter the era of advanced observatories, such as the successful launch of JWST and the forthcoming Vera C. Rubin Observatory's Legacy Survey of Space and Time (LSST), the landscape of AGN exploration across cosmic epochs is poised for exciting advancements. In this work, we delve into recent developments in AGN variability research, anticipating the substantial influx of data facilitated by LSST. The article highlights recent strides made by the AGN Polish Consortium in their contributions to LSST. The piece emphasizes the role of quasars in cosmology, dissecting the intricacies of their calibration as standard candles. The primary focus centers on the relationship between the broad-line region size and luminosity, showcasing recent breakthroughs that enhance our comprehension of this correlation. These breakthroughs encompass a range of perspectives, including spectroscopic analyses, photoionization modeling, and collaborative investigations with other cosmological tools. The study further touches on select studies, underlining how the synergy of theoretical insights and advancements in observational capabilities has yielded deeper insights into these captivating cosmic entities.

arXiv comment34 pages, 5 figures, accepted for publication as a review in MDPI/Universe

References in corpus (166)

• Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies
• LSST: from Science Drivers to Reference Design and Anticipated Data Products
• The James Webb Space Telescope
• Reverberation Measurements for 17 Quasars and the Size-Mass-Luminosity Relations in Active Galactic Nuclei
• Composite Quasar Spectra From the Sloan Digital Sky Survey
• 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
• The M-sigma and M-L Relations in Galactic Bulges and Determinations of their Intrinsic Scatter
• A Catalog of Quasar Properties from SDSS DR7
• Determining Central Black Hole Masses in Distant Active Galaxies and Quasars. II. Improved Optical and UV Scaling Relationships
• Revisiting the Unified Model of Active Galactic Nuclei
• The Low-Luminosity End of the Radius-Luminosity Relationship for Active Galactic Nuclei
• The Relationship Between Luminosity and Broad-Line Region Size in Active Galactic Nuclei
• The Atlas3D project - XV. Benchmark for early-type galaxies scaling relations from 260 dynamical models: mass-to-light ratio, dark matter, Fundamental Plane and Mass Plane
• Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei: I. Comparing the Photoionization and Reverberation Techniques
• The Near-Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope I. Overview of the instrument and its capabilities
• Active Galactic Nuclei: what's in a name?
• The Radius-Luminosity Relationship for Active Galactic Nuclei: The Effect of Host-Galaxy Starlight on Luminosity Measurements II. The Full Sample of Reverberation-Mapped AGNs
• Black Hole Spin and the Radio Loud/Quiet Dichotomy of Active Galactic Nuclei
• A Comprehensive Study on Galaxies at z~9-16 Found in the Early JWST Data: UV Luminosity Functions and Cosmic Star-Formation History at the Pre-Reionization Epoch
• Radio-Loudness of Active Galactic Nuclei: Observational Facts and Theoretical Implications
• Black Hole Mass and Eddington Ratio as Drivers for the Observable Properties of Radio-Loud and Radio-Quiet QSOs
• JADES NIRSpec Spectroscopy of GN-z11: Lyman-$\alpha$ emission and possible enhanced nitrogen abundance in a $z=10.60$ luminous galaxy
• The diversity of quasars unified by accretion and orientation
• A CEERS Discovery of an Accreting Supermassive Black Hole 570 Myr after the Big Bang: Identifying a Progenitor of Massive z > 6 Quasars
• The AGN Black Hole Mass Database
• Third Data Release of the Hyper Suprime-Cam Subaru Strategic Program
• Reverberation Mapping Measurements of Black Hole Masses in Six Local Seyfert Galaxies
• The Difference between Radio-Loud and Radio-Quiet Active Galaxies
• The Bolometric Quasar Luminosity Function at z = 0-7
• Space Telescope and Optical Reverberation Mapping Project. II. Swift and HST Reverberation Mapping of the Accretion Disk of NGC 5548
• Outflows from AGN: Kinematics of the Narrow-Line and Coronal-Line Regions in Seyfert Galaxies
• Modeling reverberation mapping data II: dynamical modeling of the Lick AGN Monitoring Project 2008 dataset
• Testing thermal reprocessing in AGN accretion discs
• GA-NIFS: A massive black hole in a low-metallicity AGN at $z\sim 5.55$ revealed by JWST/NIRSpec IFS
• On Black Hole Masses and Radio Loudness in AGN
• Spatially resolved rotation of the broad-line region of a quasar at sub-parsec scale
• The Lick AGN Monitoring Project: The MBH - sigma Relation For Reverberation-Mapped Active Galaxies
• Supermassive black holes with high accretion rates in active galactic nuclei: I. First results from a new reverberation mapping campaign
• Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. IV. H$\beta$ Time Lags and Implications for Super-Eddington Accretion
• The Sloan Digital Sky Survey Reverberation Mapping Project: H$\alpha$ and H$\beta$ Reverberation Measurements From First-year Spectroscopy and Photometry
• Reverberation Mapping Results for Five Seyfert 1 Galaxies
• Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. IX 10 New Observations of Reverberation Mapping and Shortened H$\beta$ Lags
• A Near-Infrared Spectral Template for Quasars
• A 0.8-2.4 microns spectral atlas of Active Galactic Nuclei
• The Lick AGN Monitoring Project 2011: Spectroscopic Campaign and Emission-Line Light Curves
• The faint radio sky: radio astronomy becomes mainstream
• What broad emission lines tell us about how active galactic nuclei work
• The Sloan Digital Sky Survey Reverberation Mapping Project: Sample Characterization
• A Catalog of Quasar Properties from Sloan Digital Sky Survey Data Release 16
• Radio Loud and Radio Quiet Active Galactic Nuclei
• The Nuclear Reddening Curve for Active Galactic Nuclei and the Shape of the Infra-Red to X-Ray Spectral Energy Distribution
• The Radius-Luminosity Relationship Depends on Optical Spectra in Active Galactic Nuclei
• Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. V. A New Size-Luminosity Scaling Relation for the Broad-Line Region
• Accretion disk reverberation with Hubble Space Telescope observations of NGC 4593: evidence for diffuse continuum lags
• The Variable Diffuse Continuum Emission of Broad Line Clouds
• The sub-mJy radio sky in the Extended Chandra Deep Field South: source population
• A new cosmological distance measure using AGN
• Average Quasar Spectra in the Context of Eigenvector 1
• Radio Loud and Radio Quiet Quasars
• Quasars as standard candles I: The physical relation between disc and coronal emission
• Optimization of the Observing Cadence for the Rubin Observatory Legacy Survey of Space and Time: a pioneering process of community-focused experimental design
• Supermassive black holes with high accretion rates in active galactic nuclei: II. the most luminous standard candles in the Universe
• Detailed Characterization of H_beta emission line profile in low z SDSS quasars
• The VLA Survey of the Chandra Deep Field South. V. Evolution and Luminosity Functions of sub-mJy radio sources and the issue of radio emission in radio-quiet AGN
• X-ray/UV/optical variability of NGC 4593 with Swift: Reprocessing of X-rays by an extended reprocessor
• The Near-Infrared Broad Emission Line Region of Active Galactic Nuclei -- I. The Observations
• Space Telescope and Optical Reverberation Mapping Project. V. Optical Spectroscopic Campaign and Emission-Line Analysis for NGC 5548
• The Fall of the Quasar Population
• A Revised Broad-Line Region Radius and Black Hole Mass for the Narrow-Line Seyfert 1 NGC 4051
• On the two main classes of Active Galactic Nuclei
• A new direct method for measuring the Hubble constant from reverberating accretion discs in active galaxies
• A Candidate of a Least-Massive Black Hole at the First 1.1 Billion Years of the Universe
• Self-shadowing Effects of Slim Accretion Disks in Active Galactic Nuclei: Diverse Appearance of the Broad-line Region
• Reverberation Mapping of Optical Emission Lines in Five Active Galaxies
• Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. III. Detection of Fe II Reverberation in Nine Narrow-Line Seyfert 1 Galaxies
• Quantifying the impact of variable BLR diffuse continuum contributions on measured continuum inter-band delays
• Reverberation Mapping and the Physics of Active Galactic Nuclei
• Intensive disc-reverberation mapping of Fairall 9: 1st year of Swift & LCO monitoring
• Highly Accreting Quasars: Sample Definition and Possible Cosmological Implications
• Near-infrared spectroscopy of nearby Seyfert galaxies. I. First results
• The Quasar Main Sequence explained by the combination of Eddington ratio, metallicity and orientation
• Photometric AGN reverberation mapping - an efficient tool for BLR sizes, black hole masses and host-subtracted AGN luminosities
• Machine Learning-based Brokers for Real-time Classification of the LSST Alert Stream
• The Lick AGN Monitoring Project 2011: Dynamical Modeling of the Broad-Line Region
• Supermassive black holes with high accretion rates in active galactic nuclei. XI. Accretion disk reverberation mapping of Mrk 142
• Quantifying the Diffuse Continuum Contribution of BLR Clouds to AGN Continuum Inter-band Delays
• Quasar Accretion Disk Sizes From Continuum Reverberation Mapping From the Dark Energy Survey
• Modeling the UV/optical continuum time-lags in AGN
• Long-term variability of the optical spectra of NGC 4151: II. Evolution of the broad Ha and Hb emission-line profiles
• Bubbles and outflows: the novel JWST/NIRSpec view of the z=1.59 obscured quasar XID2028
• Application of Stochastic Modeling to Analysis of Photometric Reverberation Mapping Data
• Modelling of the quasar main sequence in the optical plane
• The spatially resolved broad line region of IRAS 09149-6206
• XQR-30: the ultimate XSHOOTER quasar sample at the reionization epoch
• Near-infrared spectroscopy of nearby Seyfert galaxies - II. Molecular content and coronal emission
• A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): A First Look at the Rest-frame Optical Spectra of $z>6.5$ Quasars Using JWST
• A Sample of Massive Black Holes in Dwarf Galaxies Detected via [Fe X] Coronal Line Emission: Active Galactic Nuclei and/or Tidal Disruption Events
• Continuum Reverberation Mapping of the Accretion Disks in Two Seyfert 1 Galaxies
• The case for cases B and C: intrinsic hydrogen line ratios of the broad-line region of active galactic nuclei, reddenings, and accretion disc sizes
• The Near-Infrared Coronal Line Spectrum of 54 Nearby Active Galactic Nuclei
• Can reverberation-measured quasars be used for cosmology?
• GOALS-JWST: Mid-Infrared Spectroscopy of the Nucleus of NGC 7469
• On the multi-wavelength variability of Mrk 110: Two components acting at different timescales
• Black hole accretion discs
• Quasar Parallax: a Method for Determining Direct Geometrical Distances to Quasars
• Accretion Disk Sizes from Continuum Reverberation Mapping of AGN Selected from the ZTF Survey
• AGN Continuum Reverberation Mapping Based on Zwicky Transient Facility Light Curves
• State-of-the-art AGN SEDs for Photoionization Models: BLR Predictions Confront the Observations
• Towards equation of state of dark energy from quasar monitoring: Reverberation strategy
• XQR-30: Black Hole Masses and Accretion Rates of 42 z>6 Quasars
• Photometric reverberation mapping of 3C120
• Powerful outflows in the central parsecs of the low-luminosity Active Galactic Nucleus NGC 1386
• Spectral Energy Distributions in Three Deep-Drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time: Source Classification and Galaxy Properties
• Using [Ne V]/[Ne III] to Understand the Nature of Extreme-Ionization Galaxies
• A hard look at thermal reverberation and optical/UV lags in NGC 5548
• The CaFe Project: Optical Fe II and Near-Infrared Ca II triplet emission in active galaxies -- simulated EWs, the co-dependence of cloud sizes and metal content
• Winds Can "Blow Up" AGN Accretion Disk Sizes
• Delayed Appearance and Evolution of Coronal Lines in the TDE AT2019qiz
• Frequency-resolved lags in UV/optical continuum reverberation mapping
• Accretion Disk Size Measurements of Active Galactic Nuclei Monitored by the Zwicky Transient Facility
• GOALS-JWST: Resolving the Circumnuclear Gas Dynamics in NGC 7469 in the Mid-Infrared
• GTC Spectra of z ~ 2.3 Quasars: Comparison with Local Luminosity Analogues
• Current and future applications of Reverberation-mapped quasars in Cosmology
• The Pan-STARRS1 $\mathbf{z}>5.6$ Quasar Survey: III. The $\mathbf{z}\approx 6$ Quasar Luminosity Function
• Metallicity in Quasar Broad Line Regions at Redshift $\sim$ 6
• Chemical Abundance of z~6 Quasar Broad-Line Regions in the XQR-30 Sample
• Revisiting UV/optical continuum time lags in AGN
• The fraction and kinematics of broad absorption line quasars across cosmic time
• Quasars as high-redshift standard candles
• CLEAR: High-Ionization [Ne V] $\lambda$3426 Emission-line Galaxies at $1.4<z<2.3$
• The LSST era of supermassive black holes accretion-disk reverberation mapping
• Quasar Tomography: Unification of Echo Mapping and Photoionisation Models
• Optical continuum photometric reverberation mapping of the Seyfert-1 galaxy Mrk509
• A novel black-hole mass scaling relation based on coronal gas, and its dependence with the accretion disc
• Modelling photometric reverberation data -- a disk-like broad-line region and a potentially larger black hole mass for 3C120
• Modelling Continuum Reverberation in AGN: A Spectral-Timing Analysis of the UV Variability Through X-ray Reverberation in Fairall 9
• Placing High-Redshift Quasars in Perspective: a Catalog of Spectroscopic Properties from the Gemini Near Infrared Spectrograph -- Distant Quasar Survey
• Expectations for time-delay measurements in active galactic nuclei with the Vera Rubin Observatory
• Estimating AGN Black Hole Masses via Continuum Reverberation Mapping in the Era of LSST
• X-ray, UV and optical time delays in the bright Seyfert galaxy Ark 120 with co-ordinated Swift and ground-based observations
• Modeling photometric reverberation mapping data for the next generation of big data surveys. Quasar accretion disks sizes with the LSST
• Strong Mg II and Fe II Absorbers at 2.2 < z < 6.0
• High Eddington quasars as discovery tools: current state and challenges
• The miniJPAS survey: AGN & host galaxy co-evolution of X-ray selected sources
• LSST Cadence Strategy Evaluations for AGN Time-series Data in Wide-Fast-Deep Field
• Twisted quasar light curves: implications for continuum reverberation mapping of accretion disks
• OzDES Reverberation Mapping Program: Lag recovery reliability for 6-year CIV analysis
• Modelling time delays from two reprocessors in active galactic nuclei
• A panchromatic review of thermal and nonthermal active galactic nuclei
• Estimating reddening of the continuum and broad-line region of active galactic nuclei: the mean reddening of NGC 5548 and the size of the accretion disc
• CLASS Survey Description: Coronal Line Needles in the SDSS Haystack
• Blazar variability with the Vera C. Rubin Legacy Survey of Space and Time (LSST)
• AllBRICQS: the All-sky BRIght, Complete Quasar Survey
• The SOUX AGN Sample: SDSS-XMM-Newton Optical, Ultraviolet and X-ray selected active galactic nuclei spanning a wide range of parameter space -- Sample definition
• Black hole mass and spin estimates of the most distant quasars
• Continuum reverberation mapping of MCG 08-11-011
• Wavelength Dependences of the Optical/UV and X-ray Luminosity Correlations of Quasars
• The H$\alpha$ broadband photometric reverberation mapping of four Seyfert 1 galaxies
• First observation of double-peaked O I emission in the near-infrared spectrum of an active galaxy
• Multiple locations of near-infrared coronal lines in NGC 5548
• Dust and the intrinsic spectral index of quasar variations: hints of finite stress at the innermost stable circular orbit
• The Mass Distribution of Quasars in Optical Time-domain Surveys
• Study of the optical to X-ray broad emission lines of Mrk 110
• On the nature of the continuum reverberation of X-ray/UV and optical emission of IRAS 09149-6206
• The viewing angle in AGN SED models, a data-driven analysis

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• Effects of heterogeneous data sets and time-lag measurement techniques on cosmological parameter constraints from MgII and CIV reverberation-mapped quasar data
• Unveiling the quasar main sequence: illuminating the complexity of active galactic nuclei and their evolution
• Spectral Energy Distribution Modeling of Broad Emission Line Quasars: From X-ray to Radio Wavelengths