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On-axis spatially resolved spectroscopy of low redshift quasar host galaxies: HE 1503+0228 at z=0.135
F. Courbin, G. Letawe, P. Magain +8
We present the first result of a comprehensive spectroscopic study of quasar host galaxies. On-axis, spatially resolved spectra of low redshift quasars have been obtained with FORS…
Quasar Lensing
F. Courbin, P. Saha, P. L. Schechter
Massive structures, such as galaxies, act as strong gravitational lenses on background sources. When the background source is a quasar, several lensed images are seen, as magnified…
Time delay and lens redshift for the doubly imaged BAL quasar SBS1520+530
I. Burud, J. Hjorth, F. Courbin +6
We present optical R-band light curves of the gravitationally lensed quasar SBS1520+530 derived from data obtained at the Nordic Optical Telescope. A time delay of 130+/-3 days (1…
Cosmic alignment towards the radio Einstein ring PKS 1830-211 ?
F. Courbin, G. Meylan, J. P. Kneib +1
Optical and near-IR Hubble Space Telescope and Gemini-North adaptive optics images, further improved through deconvolution, are used to explore the gravitationally lensed radio sou…
The lensing system towards the doubly imaged quasar SBS 1520+530
C. Faure, F. Courbin, J. P. Kneib +3
The gravitational potential responsible for the lensing effect in SBS 1520+530 is studied over length scales from a few arc-seconds to a few arc-minutes. For this purpose, we use s…