Variability and the X-ray/UV ratio of active galactic nuclei. II. Analysis of a low-redshift Swift sample

F. Vagnetti, M. Antonucci, D. Trevese

Variability, both in X-ray and optical/UV, affects the well-known anti-correlation between the ${\alpha }_{ox}$ spectral index and the UV luminosity of active galactic nuclei, contributing…