Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..360...37m&link_type=abstract
AGN Variability from X-Rays to Radio Waves ASP Conference Series, Vol. 360, Proceedings of the conference held 14-16 June, 2004
Astronomy and Astrophysics
Astrophysics
4
Scientific paper
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, σ^{2}_{nxs}, 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 σ^{2}_{nxs} 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.
Magdis Georgios
Papadakis Iossif E.
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