The Variability of Quasars. II. Frequency Dependence
Astrophysics
2009-10-28 v1
Abstract
The variability of 30 PG quasars has been observed in the red band during three years. A rest-frame structure function analysis shows an increase of variability with the time interval up to 0.2 mag r.m.s. after two years. A comparison with the IUE data available for PG quasars shows that the variability increases with the rest-frame frequency at each time interval. Evidence for this effect is supported by the analysis of the average variability of other published quasar samples. The effect can completely account for the increase of variability with redshift found in other studies.
Cite
@article{arxiv.astro-ph/9512159,
title = {The Variability of Quasars. II. Frequency Dependence},
author = {A. Di Clemente and E. Giallongo and G. Natali and D. Trevese and F. Vagnetti},
journal= {arXiv preprint arXiv:astro-ph/9512159},
year = {2009}
}
Comments
23 pages, uuencoded, compressed postscript file including figures, also available at http://itovf2.roma2.infn.it/vagnetti/cimp.ps, submitted to ApJ