3 papers
astro-ph2004
A Project for a New Echo-Mapping Campaign at Intermediate Redshift
Dario Trevese, Giovanna Stirpe, Fausto Vagnetti +2
AGN masses can be estimated by "single epoch" spectral measurements through a mass-luminosity- linewidth relation calibrated by echo mapping measurements of a reference sample of l…
astro-ph2004
Redshift Dependence of QSO Spectral Variability
F. Vagnetti, D. Trevese
We present a combined analysis of the optical spectral variability for two samples of QSOs, 42 objects at monitored at the Wise Observatory (Giveon et al 1999), plus 59 obj…
astro-ph2001
Host Galaxies and the Spectral Variability of Quasars
Fausto Vagnetti, Dario Trevese
Brightness variability of QSOs is associated with variations of the spectral energy distribution in the optical-UV range. The observed change of the spectral shape depends on the c…