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Out-of-focus holography at the Effelsberg telescope
T. Cassanelli, U. Bach, B. Winkel +1
Out-of-focus (OOF) holography can be used to determine aperture deformations of radio telescopes that lead to errors in the phase of the complex aperture distribution. In contrast…
First M87 Event Horizon Telescope Results. II. Array and Instrumentation
The Event Horizon Telescope Collaboration
The Event Horizon Telescope (EHT) is a very long baseline interferometry (VLBI) array that comprises millimeter- and submillimeter-wavelength telescopes separated by distances comp…
RadioAstron gravitational redshift experiment: status update
D. A. Litvinov, U. Bach, N. Bartel +25
A test of a cornerstone of general relativity, the gravitational redshift effect, is currently being conducted with the RadioAstron spacecraft, which is on a highly eccentric orbit…
On the Calibration of Full-polarization 86GHz Global VLBI Observations
I. Marti-Vidal, T. P. Krichbaum, A. Marscher +11
We report the development of a semi-automatic pipeline for the calibration of 86 GHz full-polarization observations performed with the Global Millimeter-VLBI array (GMVA) and descr…
Unbiased flux calibration methods for spectral-line radio observations
B. Winkel, A. Kraus, U. Bach
Position and frequency switching techniques used for the removal of the bandpass dependence of radio astronomical spectra are presented and discussed in detail. Both methods are wi…