Complex UV/optical emission variability in 1H 0419-577
Abstract
We present a detailed study on the UV/optical variability and its connection to the X-ray emission using six XMM-Newton observations of a Seyfert 1 galaxy 1H 0419 - 577. All six observations consist of simultaneous coverage in the X-ray as well as in the UV/optical bands. The variable emission observed in all the bands appears correlated to each other. The UV/optical variations seem to follow the variations of X-ray band on time-scale of about three months, though, the estimation of such lag is not possible due to sparse data. The model-independent way using and indices also support the X-ray reprocessing when we compared with Grupe et al. 2010. Time-scale of variations is comparable to the size of broad line region. The broad-band X-ray to UV/optical spectral modeling supports the X-ray reprocessing scenario due to the observed excess in the UV/optical bands over the best-fit model of X-ray plus disk model. Moreover, the spectral modeling in the X-ray band also favors the changes in the geometry of corona. Furthermore, optical emission seems delayed to the UV emission before the peak and in declining part, the optical emission appears more variable compared to the UV emission. Such variations also support the changes in the geometry of disk/corona.
- Publication:
-
42nd COSPAR Scientific Assembly
- Pub Date:
- July 2018
- Bibcode:
- 2018cosp...42E2550P