1 citations · 1 across the 6 of their papers we have counts for
6 papers
VLBI detections of a source weaker than 100 mJy at 86 GHz
E. Middelberg, A. L. Roy, R. C. Walker +1
We use a new phase-calibration strategy to calibrate the phase of 86 GHz VLBI observations of the FR I radio galaxy NGC 4261. Instead of switching between a calibrator source and t…
Spectral Properties of the Core and the VLBI-Jets of Cygnus A
U. Bach, T. P. Krichbaum, E. Middelberg +4
We present a detailed VLBI study of the spectral properties of the inner core region of the radio galaxy Cygnus A at 5 GHz, 15 GHz, 22 GHz, 43 GHz and 86 GHz. Our observations incl…
Gas Around Active Galactic Nuclei and New Phase Calibration Strategies for High-Frequency VLBI
E. Middelberg
We have a project to measure magnetic fields in the obscuring tori of AGNs. We observed five free-free absorbed jets in radio galaxies with polarimetric VLBI at 15 GHz to determine…
Multi-frequency & Multi-epoch VLBI study of Cygnus A
U. Bach, M. Kadler, T. P. Krichbaum +4
We present the first multi-frequency phase-referenced observations of Cygnus A done with the VLBA at 15 and 22 GHz. We find a pronounced two-sided jet structure, with a steep spect…
Where has all the polarization gone?
E. Middelberg, A. L. Roy, U. Bach +2
We have observed the five radio galaxies NGC1052, NGC4261, Hydra A, Centaurus A and Cygnus A with polarimetric VLBI at 15 GHz to look for possible Faraday rotation in foreground ab…
Approaching NGC3079 with VLBI
E. Middelberg, T. P. Krichbaum, A. L. Roy +2
The Seyfert 2 galaxy NGC3079 is one of the nearest radio-weak AGN. We have carried out multi-frequency, multi-epoch VLBI observations of this object and detected new components, pr…