Correlation of Optical and X-ray Radiation of NGC 4151 and 3C 390.3. Preliminary Results

Abstract

Abstract. The correlation of optical and X-ray radiation of some AGN is studied. We used low signal-to-noise data from the All-Sky Monitor of the Rossi X-ray Timing Explorer (2-10 KeV) and broad-band photometry of the optical continuum obtained mainly during the last several years through the "AGN Watch" program.