240 citations · 1.5k across the 30 of their papers we have counts for
18 papers · 1 filter
Nine lensed quasars and quasar pairs discovered through spatially-extended variability in Pan-STARRS
Frédéric Dux, Cameron Lemon, Frédéric Courbin +7
We present the proof-of-concept of a method to find strongly lensed quasars using their spatially-extended photometric variability through difference imaging in cadenced imaging su…
Evidence for a milliparsec-separation Supermassive Binary Black Hole with quasar microlensing
M. Millon, C. Dalang, C. Lemon +4
We report periodic oscillations in the 15-year long optical light curve of the gravitationally lensed quasar QJ0158-4325. The signal is enhanced during a high magnification microle…
Gravitationally lensed quasars in Gaia -- IV. 150 new lenses, quasar pairs, and projected quasars
C. Lemon, T. Anguita, M. Auger +8
We report the spectroscopic follow-up of 175 lensed quasar candidates selected using Gaia Data Release 2 observations following Lemon et al. 2019. Systems include 86 confirmed lens…
Discovery of Strongly Lensed Quasars in the Ultraviolet Near Infrared Optical Northern Survey (UNIONS)
J. H. H. Chan, C. Lemon, F. Courbin +13
We report the discovery of five new doubly-imaged lensed quasars from the first 2500 square degrees of the ongoing Canada-France Imaging Survey (CFIS), which is a component of the…
J17218842: a gravitationally lensed binary quasar with a proximate damped Lyman- absorber
C. Lemon, M. Millon, D. Sluse +5
High-redshift binary quasars provide key insights into mergers and quasar activity, and are useful tools for probing the spatial kinematics and chemistry of galaxies along the line…
Strong lens systems search in the Dark Energy Survey using Convolutional Neural Networks
K. Rojas, E. Savary, B. Clément +8
We performed a search for strong lens galaxy-scale systems in the first data release of the Dark Energy Survey (DES), from a color-selected parent sample of 18~745~029 Luminous Red…
HOLISMOKES -- II. Identifying galaxy-scale strong gravitational lenses in Pan-STARRS using convolutional neural networks
R. Canameras, S. Schuldt, S. H. Suyu +6
We present a systematic search for wide-separation (Einstein radius >1.5"), galaxy-scale strong lenses in the 30 000 sq.deg of the Pan-STARRS 3pi survey on the Northern sky. With l…
Catalogues of Active Galactic Nuclei From Gaia and unWISE Data
Yiping Shu, Sergey E. Koposov, N. Wyn Evans +4
We present two catalogues of active galactic nucleus (AGN) candidates selected from the latest data of two all-sky surveys -- Data Release 2 (DR2) of the \emph{Gaia} mission and th…
Gravitationally lensed quasars in Gaia: III. 22 new lensed quasars from Gaia Data Release 2
Cameron A. Lemon, Matthew W. Auger, Richard G. McMahon
We report the discovery and spectroscopic confirmation of 22 new gravitationally lensed quasars found using data release 2. The selection was made using several tec…
An edge-on disk in the quadruply lensed quasar cross GraL~J181730853+272940139
Cristian E. Rusu, Cameron A. Lemon
Data mining through large, multi-band ground-based surveys and the recent availability of source catalogues from the {\it Gaia} space mission has led to a surge in the number of kn…
Is every strong lens model unhappy in its own way? Uniform modelling of a sample of 13 quadruply+ imaged quasars
A. J. Shajib, S. Birrer, T. Treu +70
Strong-gravitational lens systems with quadruply-imaged quasars (quads) are unique probes to address several fundamental problems in cosmology and astrophysics. Although they are i…
Gravitationally Lensed Quasars in Gaia: II. Discovery of 24 Lensed Quasars
Cameron A. Lemon, Matthew W. Auger, Richard G. McMahon +1
We report the discovery, spectroscopic confirmation and preliminary characterisation of 24 gravitationally lensed quasars identified using Gaia observations. Candidates were select…
A Gravitationally Lensed Quasar Discovered in OGLE
Z. Kostrzewa-Rutkowska, S. Kozłowski, C. Lemon +15
We report the discovery of a new gravitationally lensed quasar (double) from the Optical Gravitational Lensing Experiment (OGLE) identified inside the 670 sq. deg area encomp…
UV-Luminous, Star-Forming Hosts of z~2 Reddened Quasars in the Dark Energy Survey
C. F. Wethers, M. Banerji, P. C. Hewett +55
We present the first rest-frame UV population study of 17 heavily reddened, high-luminosity (E(B-V) 0.5; L 10ergs) broad-line quasar…
The Discovery of a Five-Image Lensed Quasar at z = 3.34 using PanSTARRS1 and Gaia
Fernanda Ostrovski, Cameron A. Lemon, Matthew W. Auger +8
We report the discovery, spectroscopic confirmation, and mass modelling of the gravitationally lensed quasar system PS J0630-1201. The lens was discovered by matching a photometric…
Gravitationally Lensed Quasars in Gaia: I. Resolving Small-Separation Lenses
Cameron A. Lemon, Matthew W. Auger, Richard G. McMahon +1
Gaia's exceptional resolution (FWHM 0.1) allows identification and cataloguing of the multiple images of gravitationally lensed quasars. We investigate a sa…
Models of the strongly lensed quasar DES J0408-5354
Adriano Agnello, Huan Lin, L. Buckley-Geer +82
We present gravitational lens models of the multiply imaged quasar DES J0408-5354, recently discovered in the Dark Energy Survey (DES) footprint, with the aim of interpreting its r…
VDES J2325-5229 a z=2.7 gravitationally lensed quasar discovered using morphology independent supervised machine learning
Fernanda Ostrovski, Richard G. McMahon, Andrew J. Connolly +56
We present the discovery and preliminary characterization of a gravitationally lensed quasar with a source redshift and image separation of lensed by a foregrou…