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First Lensed Quasar Systems from the VST-ATLAS Survey: One Quad, Two Doubles, and Two Pairs of Lensless Twins

Schechter, P.L.; Morgan, N.D.; Chehade, B.; Metcalfe, N.; Shanks, T.; McDonald, M.

First Lensed Quasar Systems from the VST-ATLAS Survey: One Quad, Two Doubles, and Two Pairs of Lensless Twins Thumbnail


Authors

P.L. Schechter

N.D. Morgan

B. Chehade

T. Shanks

M. McDonald



Abstract

We have analyzed images from the VST-ATLAS survey to identify candidate gravitationally lensed quasar systems in a sample of WISE sources with $W1-W2\gt 0.7$. Results from follow-up spectroscopy with the Baade 6.5 m telescope are presented for eight systems. One of them 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, although 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 microlensing. However, as no lensing galaxy is detected in these two systems, we classify them as lensless twins. More extensive observations are needed to establish whether they are in fact lensed quasars or physical binaries.

Citation

Schechter, P., Morgan, N., Chehade, B., Metcalfe, N., Shanks, T., & McDonald, M. (2017). First Lensed Quasar Systems from the VST-ATLAS Survey: One Quad, Two Doubles, and Two Pairs of Lensless Twins. Astronomical Journal, 153(5), Article 219. https://doi.org/10.3847/1538-3881/aa6899

Journal Article Type Article
Acceptance Date Mar 20, 2017
Online Publication Date Apr 19, 2017
Publication Date May 1, 2017
Deposit Date Jun 1, 2017
Publicly Available Date Jun 2, 2017
Journal Astronomical Journal
Print ISSN 0004-6256
Electronic ISSN 1538-3881
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 153
Issue 5
Article Number 219
DOI https://doi.org/10.3847/1538-3881/aa6899

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Copyright Statement
© 2017. The American Astronomical Society. All rights reserved.





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