Abstract

We study simultaneously observed X-ray and UV/Optical emission using seven archivalXMM-Newton observations of Seyfert 1.5 1H 0419– 577. All observations show strong soft X-ray excess below 2 keV, moderate broad Fe-K_α and variable UV/Optical emission. We find strong correlation between X-ray and UV/Optical emission. We also find increasing fractional RMS variability amplitude ( f_rms) towards higher energies. The estimated light-crossing timescale for UV to Optical emission is about few days to a week, respectively. The results thus suggest that the complex UV/Optical variability is possibly due to either X-ray reprocessing or Comptonization of the disc seed photons.