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The gravitational lens J1131-1231 - How to avoid missing an opportunity
Olaf Wucknitz, Filomena Volino
So far the lens J1131-1231 has been studied only at optical and X-ray wavelengths. A detection in the radio was almost missed as a result of an incorrect position and archive probl…
Gravitational lens surveys with LOFAR
Olaf Wucknitz, Mike Garrett
Deep surveys planned as a Key Science Project of LOFAR provide completely new opportunities for gravitational lens searches. For the first time do large-scale surveys reach the res…
From planes to spheres: About gravitational lens magnifications
O. Wucknitz
We discuss the classic theorem according to which a gravitational lens always produces a total magnification greater than unity. This theorem seems to contradict the conservation o…
A deep, high resolution survey of the low frequency radio sky
Emil Lenc, Mike A. Garrett, Olaf Wucknitz +2
We report on the first wide-field, very long baseline interferometry (VLBI) survey at 90 cm. The survey area consists of two overlapping 28 deg^2 fields centred on the quasar J0226…
Gravitational lensing
Olaf Wucknitz
This is a short and biased review of gravitational lensing with emphasis on the radio and especially VLBI aspects. We briefly explain the basic idea and give a short sketch of the…
Living life on the edge - Wide-field VLBI at 90 cm!
Emil Lenc, Mike A. Garrett, Olaf Wucknitz +2
We report on a recent 90 cm wide-field VLBI survey of two 3.1 deg^2 fields using the VLBA, Westerbork and Jodrell Bank telescopes. In-beam calibration was used to calibrate each fi…