1996/10/15 by S. Cristiani, Cristiani, S., S. Trentini +5
Engineering · Physics and Astronomy · #Adaptive optics and wavefront sensing #Astrophysics (astro-ph) #Calibration and Measurement Techniques #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9610108
9 pages, 6 figures, A&A-Latex. Accepted for publication in Astronomy & Astrophysics
arxiv created 1996/10/15 · openalex publication_date 1996/10/15 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 1.13 ± 0.05) than the B-band variability. The implications in terms of the black-hole, starburst and microlensing models are discussed.