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A Large Brightness Enhancement of the QSO 0957+561 A Component
A. Oscoz, D. Alcalde, M. Serra-Ricart +2
We report an increase of more than 0.2 mag in the optical brightness of the leading image (A) of the gravitational lens Q0957+561, detected during the 09/2000 -- 06/2001 monitoring…
QSO 2237+0305 VR light curves from Gravitational Lenses International Time Project optical monitoring
D. Alcalde, E. Mediavilla, O. Moreau +12
We present VR observations of QSO 2237+0305 conducted by the GLITP collaboration from 1999 October 1 to 2000 February 3. The observations were made with the 2.56 m Nordic Optical T…
Detection of the 2175ÅExtinction Feature at z=0.83
V. Motta, E. Mediavilla, J. A. Munoz +6
We determine the extinction curve in the z_l=0.83 lens galaxy of the gravitational lens SBS0909+532 from the wavelength dependence of the flux ratio between the lensed quasar image…