Variability properties of two Seyfert 1 Active Galactic Nuclei Mrk 493 and Zw 229.015
Abstract
From the simultaneous X-ray and UV observations of the narrow-line Seyfert 1 AGNs Mrk 493 and Zw 229.015, we study their variability properties in appreciable depth. The UV/X-ray data of Mrk 493 show remarkable correlation between the variability in both bands. Cross-corrlation analysis reveal that variations in the UV emissionn lead the X-ray emission and the measured time lag is consistent with the Comptonizastion scenario where disc UV seed photons are Compton-upscattered in the corona into the observed X-rays. Although the long-term Swift UV/X-ray emission of Zw 229.015 does not show a clear lead/lag, the source appear to be brighter in the UV when softer in X-rays. Both sources additionally show soft X-ray excess in their energy spectra which are well fitted by both the thermal comptonization and reflection models. Moreso, our spectro-temporal analyses supports the existence of a compact corona with radius r∼20Rg in AGNs
- Publication:
-
42nd COSPAR Scientific Assembly
- Pub Date:
- July 2018
- Bibcode:
- 2018cosp...42E..24A