Optical and X-ray monitoring of the NLS1 galaxy Ark 564
I. E. Papadakis, W. Brinkmann, H. Negoro, E. Detsis, I. Papamastorakis, M. Gliozzi
Abstract
The Narrow-line Seyfert galaxy Ark 564 was monitored between June 04, 2000 and June 24, 2000 from Skinakas Observatory. The B,V,R and I band light curves show night to night variations of 0.1 mag. Comparison with X-ray data from a simultaneous ASCA observation shows that the X-ray variations are more pronounced than in the optical band. Cross correlation analysis yields a time lag of ~ 0.8 days in the sense that the X-rays are leading the optical but with low statistical significance. We discuss possible implications of our results to current physical models of AGN.
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