3 papers
astro-ph2002
On the Nature of X-ray Variability in Ark 564
M. Gliozzi, W. Brinkmann, C. Raeth +3
We use data from a recent long ASCA observation of the Narrow Line Seyfert 1 Ark 564 to investigate in detail its timing properties. We show that a thorough analysis of the time se…
astro-ph2001
Detection of a high frequency break in the X-ray power spectrum of Ark 564
I. E. Papadakis, W. Brinkmann, H. Negoro +1
We present a power spectrum analysis of the long ASCA observation of Ark 564 in June/July 2001. The observed power spectrum covers a frequency range of ~ 3.5 decades. We detect a h…
astro-ph2001
Multiwavelength Monitoring of the Narrow-Line Seyfert 1 Galaxy Akn 564. III. Optical Observations and the Optical--UV--X-ray Connection
O. Shemmer, P. Romano, R. Bertram +36
We present the results of a two-year long optical monitoring program of the narrow-line Seyfert 1 galaxy Akn 564. The majority of this monitoring project was also covered by X-ray…