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Opacity in compact extragalactic radio sources and its effect on astrophysical and astrometric studies
Y. Y. Kovalev, A. P. Lobanov, A. B. Pushkarev +1
The apparent position of the "core" in a parsec-scale radio jet (a compact, bright emitting region at the narrow end of the jet) depends on the observing frequency, owing to synchr…
The Trails of Superluminal Jet Components in 3C111
M. Kadler, E. Ros, M. Perucho +8
In 1996, a major radio flux-density outburst occured in the broad-line radio galaxy 3C111. It was followed by a particularly bright plasma ejection associated with a superluminal j…
Opacity in compact extragalactic radio sources and its effect on radio-optical reference frame alignment
Y. Y. Kovalev, A. P. Lobanov, A. B. Pushkarev +1
Accurate alignment of the radio and optical celestial reference frames requires detailed understanding of physical factors that may cause offsets between the positions of the same…
Intrinsic Structure and Kinematics of the Sub-Parsec Scale Jet of M87
Y. Y. Kovalev
We report new results from a sub-parsec scale study of the inner jet in M87 performed at 15 GHz with the Very Long Baseline Array. We have detected a limb brightened structure of t…
The Inner Jet of the Radio Galaxy M87
Y. Y. Kovalev, M. L. Lister, D. C. Homan +1
We report new 2 cm VLBA images of the inner radio jet of M87 showing a limb brightened structure and unambiguous evidence for a faint 3 mas long counter-feature which also appears…
Combined VLBI- and X-ray Observations of Active Galactic Nuclei
M. Kadler, E. Ros, J. Kerp +2
Compact radio cores in radio-loud active galactic nuclei (AGNs) are classical targets of Very-Long-Baseline interferometric (VLBI) research. Until today little has been known about…