7 papers
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…
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…
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…
Optical spectral variability of PG QSOs
D. Trevese, F. Vagnetti
In previous studies we have shown that the optical variability of quasars increases, on average, with redshift. We explained this dependance in terms of a hardening of the spectrum…
Spectral Variability of QSOs in the Optical Band
Dario Trevese, Fausto Vagnetti
A new analysis of the variability of the spectral slope of PG QSOs has been performed, on the basis of recent literature data in the B and R photometric bands. Preliminary results…
The luminosity function of cluster galaxies: relations among M_1, M* and the morphological type
D. Trevese, G. Cirimele, B. Appodia
A study of the luminosity function of 36 Abell clusters of galaxies has been carried out using photographic plates obtained with the Palomar 1.2 m Schmidt telescope. The relation b…