5 papers · 1 filter
Non-stationary variability in AGN: the case of 3C 390.3
M. Gliozzi, I. E. Papadakis, R. M. Sambruna +1
We use data from a two-year intensive RXTE monitoring campaign of the broad-line radio galaxy 3C 390.3 to investigate its stationarity. In order to exploit the potential informatio…
Optical and X-ray monitoring of the NLS1 galaxy Ark 564
I. E. Papadakis, W. Brinkmann, H. Negoro +3
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 variat…
ROSAT HRI monitoring of X-ray variability in the NLS1 galaxy PKS 0558-504
M. Gliozzi, Th. Boller, W. Brinkmann +1
We present the results of ROSAT High Resolution Imager (HRI) observations and the survey data of the radio-loud Narrow-Line Seyfert 1 galaxy (NLS1) PKS 0558--504. We find strong an…
ROSAT HRI observations of radio-loud AGN
M. Gliozzi, W. Brinkmann, S. A. Laurent-Muehleisen +2
We present the results of three ROSAT HRI observations of AGN expected to reside in clusters of galaxies. Although the exposures were truncated by the premature end of the ROSAT mi…
Phase Variability in the Optical Polarization of GRO J1655--40
M. Gliozzi, G. Bodo, G. Ghisellini +2
We present the results of the new optical polarimetric observations of the superluminal source GRO J1655--40, carried out in July 1997, with the multichannel photopolarimeter of th…