Beschreibung:
<jats:title>Abstract</jats:title><jats:p>We present the results of an analysis of the UV and X-ray variability of the broad-line radio galaxy 3C 390.3 over 15 years. The UV continuum of 3C 390.3 showed large variations with amplitudes of up to a factor of 10. The variations of C IV and Ly<jats:italic>α</jats:italic> are highly correlated with the UV continuum, and are delayed with respect to the continuum variations by 65-120 days with the red wing of both C IV and Ly<jats:italic>α</jats:italic> leading the blue wing, implying that the C IV and Ly<jats:italic>α</jats:italic>-emitting gas is infalling towards the center. The C IV/Ly<jats:italic>α</jats:italic> ratio is positively correlated with both the continuum flux and UV line strength. The overall UV/optical to X-ray spectrum can be described by a single power law with α<jats:italic><jats:sub>uvx</jats:sub></jats:italic> = 0.90. The behavior of C IV/Lyα variations might be related to this hard ionizing continuum in 3C 390.3.</jats:p>