Gravitationally Lensed Quasars in Gaia: II. Discovery of 24 Lensed Quasars
Cameron A. Lemon, Matthew W. Auger, Richard G. McMahon, Fernanda, Ostrovski

TL;DR
This paper reports the discovery and preliminary analysis of 24 gravitationally lensed quasars identified using Gaia data, highlighting the effectiveness of Gaia-based selection methods and providing insights into lens properties and detection limitations.
Contribution
The study introduces a new Gaia-based approach for discovering gravitationally lensed quasars and presents the first large sample of such lenses identified through this method.
Findings
Discovered 24 gravitationally lensed quasars with median separation 2.13 arcsec.
Identified 4 quadruply-imaged and 20 doubly-imaged systems.
Compared lens properties with simulated samples to assess detection biases.
Abstract
We report the discovery, spectroscopic confirmation and preliminary characterisation of 24 gravitationally lensed quasars identified using Gaia observations. Candidates were selected in the Pan-STARRS footprint with quasar-like WISE colours or as photometric quasars from SDSS, requiring either multiple detections in Gaia or a single Gaia detection near a morphological galaxy. The Pan-STARRS grizY images were modelled for the most promising candidates and 60 candidate systems were followed up with the William Herschel Telescope. 13 of the lenses were discovered as Gaia multiples and 10 as single Gaia detections near galaxies. We also discover 1 lens identified through a quasar emission line in an SDSS galaxy spectrum. The lenses have median image separation 2.13 arcsec and the source redshifts range from 1.06 to 3.36. 4 systems are quadruply-imaged and 20 are doubly-imaged. Deep CFHT…
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