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astro-ph2002★ 70 cited
The time delay of the quadruple quasar RX J0911.4+0551
Jens Hjorth, Ingunn Burud, Andreas O. Jaunsen +9
We present optical lightcurves of the gravitationally lensed components A (=A1+A2+A3) and B of the quadruple quasar RX J0911.4+0551 (z = 2.80). The observations were primarily obta…
astro-ph2000
An optical time-delay estimate for the double gravitational lens system B1600+434
I. Burud, J. Hjorth, A. O. Jaunsen +7
We present optical I-band light curves of the gravitationally lensed double QSO B1600+434 from observations obtained at the Nordic Optical Telescope (NOT) between April 1998 and No…
astro-ph2000
Constraints on source and lens parameters from microlensing variability in QSO 0957+561 A,B
S. Refsdal, R. Stabell, J. Pelt +1
From regular monitoring of the Double Quasar QSO 0957+561 A,B there is now general agreement on a time delay of about 416 days. This has made it possible to determine the microlens…