Complex Optical/UV to X-ray spectral variability of 1H 0419–577

Main Pal1*, G. C. Dewangan1, R. Misra1 and P. K. Pawar2
1IUCAA, Post Bag 4, Ganeshkhind, Pune University Campus, Pune 411007, India
2Swami Ramanand Teerth Marathwada University, Nanded, India

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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-Kα and variable UV/Optical emission. We find strong correlation between X-ray and UV/Optical emission. We also find increasing fractional RMS variability amplitude ( frms) 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.



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Keywords : galaxies: active, galaxies: Seyfert, galaxies: nuclei, X-rays: galaxies, galaxies: disc