Gaia Focused Product Release: A catalogue of sources around quasars to search for strongly lensed quasars
Gaia Collaboration, A. Krone-Martins, C. Ducourant, L. Galluccio, L., Delchambre, I. Oreshina-Slezak, R. Teixeira, J. Braine, J.-F. Le Campion, F., Mignard, W. Roux, A. Blazere, L. Pegoraro, A.G.A. Brown, A. Vallenari, T., Prusti, J.H.J. de Bruijne, F. Arenou, C. Babusiaux

TL;DR
This paper introduces the GravLens pipeline analyzing Gaia data to identify potential strongly lensed quasars by clustering detections around quasars and applying scoring methods, resulting in a catalog of lens candidates.
Contribution
The paper presents a novel pipeline using Gaia data and clustering algorithms to systematically identify and score potential gravitational lens systems around quasars.
Findings
Analyzed 3.76 million quasars and found nearly 4.76 million sources within 6".
Proposed 381 lens candidates, with 49 most promising.
Published a comprehensive catalog of sources around quasars in the Gaia archive.
Abstract
Context. Strongly lensed quasars are fundamental sources for cosmology. The Gaia space mission covers the entire sky with the unprecedented resolution of " in the optical, making it an ideal instrument to search for gravitational lenses down to the limiting magnitude of 21. Nevertheless, the previous Gaia Data Releases are known to be incomplete for small angular separations such as those expected for most lenses. Aims. We present the Data Processing and Analysis Consortium GravLens pipeline, which was built to analyse all Gaia detections around quasars and to cluster them into sources, thus producing a catalogue of secondary sources around each quasar. We analysed the resulting catalogue to produce scores that indicate source configurations that are compatible with strongly lensed quasars. Methods. GravLens uses the DBSCAN unsupervised clustering algorithm to detect sources…
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Taxonomy
TopicsAstronomy and Astrophysical Research · Gamma-ray bursts and supernovae · Cosmology and Gravitation Theories
