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A new direct method for measuring the Hubble constant from reverberating accretion discs in active galaxies
Stefan Collier, Kieth Horne, Ignaz Wanders +1
We show how wavelength-dependent time delays between continuum flux variations of AGN can be used to test the standard black hole-accretion disc paradigm, by measuring the temperat…
Does the AGN Continuum Shape Change with Luminosity?
P. Romano, B. M. Peterson
We test the general wisdom that AGN continua vary with larger amplitude at shorter wavelengths, through a re-analysis of historical data from the optical and UV (IUE) monitoring ca…
Optical Continuum and Emission-Line Variability of Seyfert 1 Galaxies
Bradley M. Peterson, Ignaz Wanders, Ray Bertram +3
We present the light curves obtained during an eight-year program of optical spectroscopic monitoring of nine Seyfert 1 galaxies: 3C 120, Akn 120, Mrk 79, Mrk 110, Mrk 335, Mrk 509…
On Uncertainties in Cross-Correlation Lags and the Reality of Wavelength-Dependent Continuum Lags in Active Galactic Nuclei
Bradley M. Peterson, Ignaz Wanders, Keith Horne +4
We describe a model-independent method of assessing the uncertainties in cross-correlation lags determined from AGN light curves, and use this method to investigate the reality of…