The optical variability of QSOs. II. The wavelength dependence
Abstract
The long-term variability of a sample of 149 optically selected QSOs in the field of the Selected Area 94 has been studied in the R-band. The relations between variability and luminosity and between variability and redshift have been investigated by means of ``robust'' statistical estimators, allowing to disentangle the effects of the measurement errors. The results are compared with the corresponding properties of the variability in the B-band for the same sample. An anti-correlation between the R-band variability and the intrinsic luminosity is found, analogously to what is observed in the B-band. The amplitude of the R-band variability turns out to be smaller (of a factor ) than the B-band variability. The implications in terms of the black-hole, starburst and microlensing models are discussed.
Keywords
Cite
@article{arxiv.astro-ph/9610108,
title = {The optical variability of QSOs. II. The wavelength dependence},
author = {S. Cristiani and S. Trentini and F. La Franca and P. Andreani},
journal= {arXiv preprint arXiv:astro-ph/9610108},
year = {2007}
}
Comments
9 pages, 6 figures, A&A-Latex. Accepted for publication in Astronomy & Astrophysics