Scalable and Robust Multiband Modeling of AGN Light Curves in Rubin-LSST

Abstract

The Vera C. Rubin Observatory's Legacy Survey of Space and Time (LSST) will monitor tens of millions of active galactic nuclei (AGNs) for a period of 10 years with an average cadence of 3 days in six broad photometric bands. This unprecedented dataset will enable robust characterizations of AGN UV/optical variability across a wide range of AGN physical properties. However, existing tools for modeling AGN light curves are not yet capable of fully leveraging the volume, cadence, and multiband nature of LSST data. We present EzTaoX, a scalable light curve modeling tool designed to take advantage of LSST's multiband observations to simultaneously characterize AGN UV/optical stochastic variability and measure interband time delays. EzTaoX achieves a speed increase of $\sim 10^2-10^4\times$ on CPUs over current tools with similar capabilities, while maintaining equal or better accuracy in recovering simulated variability properties. This performance gain enables continuum time-delay measurements for all AGNs discovered by LSST -- both in the Wide Fast Deep survey and the Deep Drilling Fields -- thereby opening new opportunities to probe AGN accretion-flow geometries. In addition, EzTaoX's multiband capability allows robust characterization of AGN stochastic variability down to hourly timescales, facilitating the identification of accreting low-mass AGNs -- such as those residing in dwarf galaxies -- through their distinctive variability signatures.

Accepted for publication in ApJ, 24 pages, 15 figures

References in corpus (48)

• Array Programming with NumPy
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• The Zwicky Transient Facility: Science Objectives
• Modeling the Time Variability of SDSS Stripe 82 Quasars as a Damped Random Walk
• Is Quasar Optical Variability a Damped Random Walk?
• Space Telescope and Optical Reverberation Mapping Project. II. Swift and HST Reverberation Mapping of the Accretion Disk of NGC 5548
• Testing thermal reprocessing in AGN accretion discs
• Reverberation mapping of Active Galactic Nuclei: from X-ray corona to dusty torus
• Quasar Accretion Disks Are Strongly Inhomogeneous
• Space Telescope and Optical Reverberation Mapping Project. I. Ultraviolet Observations of the Seyfert 1 Galaxy NGC 5548 with the Cosmic Origins Spectrograph on Hubble Space Telescope
• A characteristic optical variability timescale in astrophysical accretion disks
• Are the Variability Properties of the Kepler AGN Light Curves Consistent with a Damped Random Walk?
• Limitations on the recovery of the true AGN variability parameters using Damped Random Walk modeling
• X-ray and Ultraviolet Properties of AGN in Nearby Dwarf Galaxies
• Quasar Selection Based on Photometric Variability
• Improving Damped Random Walk parameters for SDSS Stripe 82 Quasars with Pan-STARRS1
• Modeling the UV/optical continuum time-lags in AGN
• Detection of Time Lags Between Quasar Continuum Emission Bands based on Pan-STARRS Light-curves
• Optical Variability of Quasars with 20-Year Photometric Light Curves
• Modelling type 1 quasar colours in the era of Rubin and Euclid
• Examining AGN UV/optical Variability Beyond the Simple Damped Random Walk
• Lognormal variability in BL Lacertae
• 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
• The dual nature of blazar fast variability. Space and ground observations of S5 0716+714
• Variability-selected intermediate mass black hole candidates in dwarf galaxies from ZTF and WISE
• The complex variability of blazars: Time-scales and periodicity analysis in S4 0954+65
• Dwarf AGNs from Optical Variability for the Origins of Seeds (DAVOS): Insights from the Dark Energy Survey Deep Fields
• A Non-parametric Approach to Constrain the Transfer Function in Reverberation Mapping
• Bayesian Analysis of Quasar Lightcurves with a Running Optimal Average: New Time Delay Measurements of COSMOGRAIL Gravitationally Lensed Quasars
• A structure function analysis of VST-COSMOS AGN
• The LSST era of supermassive black holes accretion-disk reverberation mapping
• A random forest-based selection of optically variable AGN in the VST-COSMOS field
• Gaussian Process Modeling Blazar Multiwavelength Variability: Indirectly Resolving Jet Structure
• Persistent and occasional: searching for the variable population of the ZTF/4MOST sky using ZTF data release 11
• Testing Super-Eddington Accretion onto a Supermassive Black Hole: Reverberation Mapping of PG 1119+120
• Ensemble power spectral density of SDSS quasars in UV/optical bands
• How can the optical variation properties of active galactic nuclei be unbiasedly measured?
• Continuum optical-UV and X-ray variability of AGN: current results and future challenges
• Latent Stochastic Differential Equations for Modeling Quasar Variability and Inferring Black Hole Properties
• Dwarf AGNs from Variability for the Origins of Seeds (DAVOS): Optical Variability of Broad-line Dwarf AGNs from the Zwicky Transient Facility
• Using Gaussian Processes to detect AGN flares
• Modelling variability power spectra of active galaxies from irregular time series
• The Success of Optical Variability in Uncovering AGNs in Low-stellar Mass Galaxies
• Examining AGN UV/Optical Variability Beyond the Simple Damped Random Walk. II. Insights from 22 Years Observations of SDSS, PS1 and ZTF
• Application of the FRADO model of BLR formation to the Seyfert galaxy NGC 5548 and the first step toward determining the Hubble constant

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