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Paper: An Optical Variability Study of Quasars Using the MACHO Light Curves
Volume: 360, AGN Variability from X-Rays to Radio Waves
Page: 37
Authors: Magdis, G.; Papadakis, I.E.
Abstract: We present the results of a study of the optical variability properties of quasars using long, high-quality light curves from the MACHO project. We have used the normalized excess variance, σ2nxs, as a measure of the variability amplitude of each object. We find that the excess variance of the V -band light curves is systematically larger than the excess variance of the R-band light curves in all objects, irrespective of their luminosity or redshift. We also find that σ2nxs decreases with increasing source luminosity, while it does not depend on redshift. We have also studied the correlation between variations in the V and R-band light curves. We do not observe significant delays, while the amplitude of the average, rest-frame cross-correlation function appears to decrease as the source luminosity decreases.
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