Optical continuum lags in NGC 4395 remain stable at 5-15 minutes over multi-year baselines with negligible diffuse continuum contribution.
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Low-luminosity AGN exhibit optical variability structure function slopes that increase with black hole mass from ~0.1 to ~0.3, with amplitude anticorrelated with luminosity, no breaks observed, and variability continuing to rise on 20-year timescales.
Migration traps concentrate stellar-mass black holes in AGN disks, generating self-regulated magnetic reconnection heating that yields excess short-timescale optical/UV variability, flattened structure functions, and deviations from the τ∝λ^{4/3} lag relation.
Simultaneous observations of NGC 4151 and UGC 3374 show that ICCF-Cut photometric Hα light curves and lags match spectroscopic results within uncertainties, with minor discrepancies attributed to He I contamination that can be corrected.
Reverberation lags in Mrk 817 range 3-8 days, exceed thin-disk models by factors of 3-6, follow a λ^{4/3} trend with the ICCF method, and vary by up to a factor of 2 between epochs.
citing papers explorer
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The Intermediate-Mass Black Hole Reverberation Mapping Project: Stable Optical Continuum Lags of an IMBH in the Dwarf Galaxy NGC 4395 Over Years
Optical continuum lags in NGC 4395 remain stable at 5-15 minutes over multi-year baselines with negligible diffuse continuum contribution.
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Optical Variability Structure Function of Low-Luminosity AGN using ATLAS Lightcurves
Low-luminosity AGN exhibit optical variability structure function slopes that increase with black hole mass from ~0.1 to ~0.3, with amplitude anticorrelated with luminosity, no breaks observed, and variability continuing to rise on 20-year timescales.
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Migration Traps as Variability Attractors: Optical/UV Signatures of Embedded Stellar-Mass Black Holes in Active Galactic Nucleus Disks
Migration traps concentrate stellar-mass black holes in AGN disks, generating self-regulated magnetic reconnection heating that yields excess short-timescale optical/UV variability, flattened structure functions, and deviations from the τ∝λ^{4/3} lag relation.
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Validating the ICCF-Cut Method with Simultaneous Photometric and Spectroscopic H$\alpha$ Reverberation Mapping of NGC 4151 and UGC 3374
Simultaneous observations of NGC 4151 and UGC 3374 show that ICCF-Cut photometric Hα light curves and lags match spectroscopic results within uncertainties, with minor discrepancies attributed to He I contamination that can be corrected.
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AGN STORM 2. XII. Ground-Based Optical Photometry and Lag Measurements of Mrk 817
Reverberation lags in Mrk 817 range 3-8 days, exceed thin-disk models by factors of 3-6, follow a λ^{4/3} trend with the ICCF method, and vary by up to a factor of 2 between epochs.