Gravitational lens J1004+4112

Dr Luka Č. Popović The wide-separation lensed quasar SDSS J1004+4112 was discovered in the Sloan Digital Sky Survey (SDSS) search for lenses (Inada et al. 2003).
The lens consists of at least four images of a redshift zs = 1.734 quasar whose 15.0′′ Einstein ring diameter is created by a redshift zl = 0.68 cluster.
In Fig. we present the brightness of the images (ABCD-upper panel) at different wavelengths (bottom panel).
The lens was observed with the integral-field Multipupil Fiber Spectrograph (MPFS) at the prime focus of the Russian 6-m telescope of the Special Astrophysical Observatory (SAO) in 2007 (work in progress=