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Modeling nuclei of radio galaxies from VLBI radio observations. Application to the BL Lac Object S5 1803+784
J. Roland, S. Britzen, N. A. Kudryavtseva +2
We present a new method to fit the variations of both coordinates of a VLBI component as a function of time, assuming that the nucleus of the radio source contains a binary black h…
The Kinematics of S5 1803+784
N. A. Kudryavtseva, S. Britzen, A. Witzel +8
We present the results of a multi-frequency analysis of the structural variability in the parsec-scale jet of the blazar S5 1803+784. More than 90 epochs of observations at 6 frequ…
Frequency-dependent time delays for strong outbursts in four blazars from the Metsahovi and UMRAO monitoring databases
T. B. Pyatunina, N. A. Kudryavtseva, D. C. Gabuzda +4
The combined data of the University of Michigan Radio Astronomy Observatory and Metsahovi Radio Observatory provide us with radio light curves for Active Galactic Nuclei monitored…
Coordinated Multiwavelength Observations of BL Lacertae in 2000
M. Boettcher
BL Lacertae was the target of an extensive multiwavelength monitoring campaign in the second half of 2000. Simultaneous or quasi-simultaneous observations were taken at radio (UMRA…