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astro-ph2001★ 86 cited
Quasar Spectral Slope Variability in the Optical Band
D. Trevese, F. Vagnetti
We performed a new analysis of B and R light curves of a sample of PG quasars. We confirm the variability-redshift correlation and its explanation in terms of spectral variability,…
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…