VLBA Observations of 3C 120

VLBA polarimetric observations of 3C 286 at 5 GHz

Polarimetric observations at 5 GHz using the VLBA are reported of the compact steep spectrum source 3C 286. There are two flat spectrum knots but both are too highly polarized to be a typical core component and both appear to be resolved in VLBA measurements. The morphology and polarization structure of this source is also quite distinct from typical core–jet sources. It is suggested that the c...

Vlba Monitoring of the Qso 3c 345

VLBA Observations of Blazars

VLBI observations of blazars provide the closest look at compact jets that are thought to be responsible for the variable emission of blazars from radio to γ-ray wavelengths. It appears that flux variability at different wavelengths is connected to changes in jet structure near its base. The changes happen on timescales of weeks or less, which require frequent VLBI monitoring to follow. Current...

Monthly 43 Ghz Vlba Polarimetric Monitoring of 3c 120 over 16 Epochs: Evidence for Trailing Shocks in a Relativistic Jet

We present a 16-month sequence of monthly polarimetric 43 GHz VLBA images of the radio galaxy 3C 120. The images probe the inner regions of the radio jet of this relatively nearby superluminal radio galaxy at a linear resolution of 0.07 h 65 pc (Ho = 65 h65 km s −1 Mpc). We follow the motion of a number of features with apparent velocities between 4.01±0.08 and 5.82±0.13 h 65 c. A new superlumi...

Multi - transition VLBA observations of circumstellar SiO

On this paper, we present simultaneous VLBA observations of the J=1–0 and J=2–1 rotational lines in the v=1 and v=2 vibra-tionally excited states of SiO (at λ ∼ 7 and 3 mm). We have mapped these four maser lines in the circumstellar envelopes of three AGB stars: IRC +10011, χ Cyg and TX Cam. We study the relative spatial distribution between these maser lines. In particular, for the two v=1 tra...