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The microarcsecond quasar J1819+3845
J. Dennett-Thorpe, A. G. de Bruyn
We present new WSRT observations of the micro-arcsecond quasar J1819+3845. All short term variations are attributed to interstellar scintillation of a source which is at most 30 mi…
WSRT Observations of the Hubble Deep Field Region
M. A. Garrett, A. G. de Bruyn, M. Giroletti +2
We present deep WSRT 1.4 GHz observations of the Hubble Deep Field region. At the 5 sigma level, the WSRT clearly detects 85 regions of radio emission in a 10' x 10' field centred…
CLASS B0827+525: `Dark lens' or binary radio-loud quasar?
L. V. E. Koopmans, A. G. de Bruyn, C. D. Fassnacht +12
We present radio, optical, near-infrared and spectroscopic observations of the source B0827+525. We consider this source as the best candidate from the Cosmic Lens All-Sky Survey (…
A radio-microlensing caustic crossing in B1600+434?
L. V. E. Koopmans, A. G. de Bruyn, J. Wambsganss +1
First, we review the current status of the detection of strong `external' variability in the CLASS gravitational B1600+434, focusing on the 1998 VLA 8.5-GHz and 1998/9 WSRT multi-f…
Structure in the local Galactic ISM on scales down to 1 pc, from multi-band radio polarization observations
M. Haverkorn, P. Katgert, A. G. de Bruyn
We discuss observations of the linearly polarized component of the diffuse galactic radio background. These observations, with an angular resolution of 4', were made with the Weste…
A time-delay determination from VLA light curves of the CLASS gravitational lens B1600+434
L. V. E. Koopmans, A. G. de Bruyn, E. Xanthopoulos +1
We present Very Large Array (VLA) 8.5-GHz light curves of the two lens images of the Cosmic Lens All Sky Survey (CLASS) gravitational lens B1600+434. We find a nearly linear decrea…