Vyacheslav N. Shalyapin, Luis J. Goicoechea
We are using OSIRIS at the 10.4-m Gran Telescopio CANARIAS (GTC) to obtain
spectra of faint galaxies close to multiply imaged quasars. We initially
focused on the fields of HE 1413+117 (Cloverleaf quasar) and SDSS 1116+4118. In
this contribution, we present long-slit spectroscopy of two galaxies in the
southwest of the Cloverleaf, and show that one of them makes a negligible
contribution to the external shear of the gravitational lens system. Spectra of
the main lensing galaxy candidate in SDSS 1116+4118 are also analysed and
discused. If gravitational lensing is causing the quasar image splitting, our
spectra reveal that the main lens can not consist of only one dominant galaxy.
View original:
http://arxiv.org/abs/1201.4115
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