6 papers
HI kinematics in a massive spiral galaxy at z=0.89
L. V. E. Koopmans, A. G. de Bruyn
We present a kinematic model of the neutral-hydrogen in the spiral galaxy of the lens system PKS1830-211, based on a Multi Element Radio-Linked Interferometer (MERLIN) 1.4-GHz radi…
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…
Everything you ever wanted to know about the JVAS gravitational lens system B1030+074 but were afraid to ask
E. Xanthopoulos, I. W. A. Browne, P. N. Wilkinson +6
We present an overview of all the observations (radio - VLA, MERLIN, VLBA,EVN - and optical - WFPC2 and NICMOS -) that were initially used to confirm the gravitational lens nature…
VLA 8.4 GHz monitoring observations of the CLASS gravitational lens B1933+503
I. W. A. Browne, E. Xanthopoulos, A. D. Biggs +1
The complex 10-component gravitational lens B1933+503 has been monitored with the VLA during the period February to June 1998. Here we present the results of this A-configuration 8…
Measuring H_0 with CLASS B1608+656: The Second Season of VLA Monitoring
C. D. Fassnacht, E. Xanthopoulos, L. V. E. Koopmans +3
The four-component gravitational lens CLASS B1608+656 has been monitored with the VLA for two seasons in order to search for time delays between the components. These time delays c…
Lensing galaxies: light or dark?
N. Jackson, P. Helbig, I. W. A. Browne +4
In a recent paper, Hawkins (1997) argues on the basis of statistical studies of double-image gravitational lenses and lens candidates that a large population of dark lenses exists…