First lensed quasar systems from the VST-ATLAS survey: one quad, two doubles and two pairs of lensless twins

Abstract

We have analyzed images from the VST ATLAS survey to identify candidate gravitationally lensed quasar systems in a sample of WISE sources with W1 - W2 > 0.7. Results from followup spectroscopy with the Baade 6.5 m telescope are presented for eight systems. One of these is a quadruply lensed quasar and two are doubly lensed systems. Two are projected superpositions of two quasars at different redshifts. In one system two quasars, though at the same redshift, have very different emission line profiles, and constitute a physical binary. In two systems the component spectra are consistent with the lensing hypothesis, after allowing for micro-lensing. But as no lensing galaxy is detected in these two, we classify them as lensless twins. More extensive observations are needed to establish whether they are in fact lensed quasars or physical binaries.

Accepted for publication in the Astronomical Journal. Title changed to reflect the confirmation of one lensless twin as a lensed double and the inclusion a second lensed double. 27 pages, 8 figures

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