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Adiabatic expansion and magnetic fields in AGN jets
A. B. Pushkarev, Y. Y. Kovalev, A. P. Lobanov
Results of high-resolution simultaneous multi-frequency 8.1-15.4 GHz VLBA polarimetric observations of relativistic jets in active galactic nuclei (the MOJAVE-2 project) are analyz…
Probing parsec scale jets in AGN with geodetic VLBI
A. B. Pushkarev, Y. Y. Kovalev
We report on an ongoing effort to image active galactic nuclei simultaneously observed at 2.3 and 8.6 GHz in the framework of a long-term VLBI project RDV (Research and Development…
Physics of the central region in the quasar 0850+581
Y. Y. Kovalev, A. P. Lobanov, A. B. Pushkarev
The apparent position of the origin (core) of extragalactic radio jets shifts with the observing frequency, owing to synchrotron self-absorption and external absorption. One of the…
Testing adiabatic expansion of shocks in parsec-scale jets by dual-frequency VLBI experiments
A. B. Pushkarev, Y. Y. Kovalev, A. P. Lobanov
We present results of simultaneous dual-frequency (2 GHz and 8 GHz) very long baseline interferometry (VLBI) observations of 12 active galactic nuclei with prominent jets. Spectral…
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…
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…