2 papers
astro-ph1994
Radial cluster lensing: A simple differential equation describing arclet fields
T. Schramm, R. Kayser
Clusters of galaxies acting as gravitational lenses deform the images of background galaxies. For small galaxies the deformation is determined by the local properties of the lens (…
astro-ph1994
Time delay controversy on QSO 0957+561 not yet decided
J. Pelt, W. Hoff, R. Kayser +2
We present a new analysis of previously published optical and radio data sets of the gravitationally lensed quasar 0957+561 A,B with the aim of determining the time delay between i…